diff --git a/CHANGELOG.md b/CHANGELOG.md
index b7d07b8..1a38cb4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.2.3 (unreleased)
+
+- Added build phase progress for Postgres 12+
+
 ## 0.2.2 (2022-01-15)
 
 - Fixed compilation error on Mac ARM
diff --git a/src/ivfbuild.c b/src/ivfbuild.c
index ce585af..2669ddd 100644
--- a/src/ivfbuild.c
+++ b/src/ivfbuild.c
@@ -82,6 +82,8 @@ SampleRows(IvfflatBuildState * buildstate)
 	int			targsamples = buildstate->samples->maxlen;
 	BlockNumber totalblocks = RelationGetNumberOfBlocks(buildstate->heap);
 
+	IvfflatUpdateProgress(PROGRESS_IVFFLAT_PHASE_SAMPLE);
+
 	buildstate->rowstoskip = -1;
 
 	BlockSampler_Init(&buildstate->bs, totalblocks, targsamples, random());
@@ -220,6 +222,8 @@ InsertTuples(Relation index, IvfflatBuildState * buildstate, ForkNumber forkNum)
 #endif
 	TupleDesc	tupdesc = RelationGetDescr(index);
 
+	IvfflatUpdateProgress(PROGRESS_IVFFLAT_PHASE_LOAD);
+
 	GetNextTuple(buildstate->sortstate, tupdesc, slot, &itup, &list);
 
 	for (i = 0; i < buildstate->centers->length; i++)
@@ -342,6 +346,7 @@ ComputeCenters(IvfflatBuildState * buildstate)
 		SampleRows(buildstate);
 
 	/* Calculate centers */
+	IvfflatUpdateProgress(PROGRESS_IVFFLAT_PHASE_KMEANS);
 	IvfflatKmeans(buildstate->index, buildstate->samples, buildstate->centers);
 
 	/* Free samples before we allocate more memory */
@@ -432,6 +437,8 @@ CreateEntryPages(IvfflatBuildState * buildstate, ForkNumber forkNum)
 	Oid			sortCollations[] = {InvalidOid};
 	bool		nullsFirstFlags[] = {false};
 
+	IvfflatUpdateProgress(PROGRESS_IVFFLAT_PHASE_SORT);
+
 #if PG_VERSION_NUM >= 110000
 	buildstate->sortstate = tuplesort_begin_heap(buildstate->tupdesc, 1, attNums, sortOperators, sortCollations, nullsFirstFlags, maintenance_work_mem, NULL, false);
 #else
diff --git a/src/ivfflat.c b/src/ivfflat.c
index 38a3bed..d0c94ac 100644
--- a/src/ivfflat.c
+++ b/src/ivfflat.c
@@ -8,6 +8,10 @@
 #include "utils/guc.h"
 #include "utils/selfuncs.h"
 
+#if PG_VERSION_NUM >= 120000
+#include "commands/progress.h"
+#endif
+
 int			ivfflat_probes;
 static relopt_kind ivfflat_relopt_kind;
 
@@ -30,6 +34,31 @@ _PG_init(void)
 							1, 1, IVFFLAT_MAX_LISTS, PGC_USERSET, 0, NULL, NULL, NULL);
 }
 
+/*
+ * Get the name of index build phase
+ */
+#if PG_VERSION_NUM >= 120000
+static char *
+ivfflatbuildphasename(int64 phasenum)
+{
+	switch (phasenum)
+	{
+		case PROGRESS_CREATEIDX_SUBPHASE_INITIALIZE:
+			return "initializing";
+		case PROGRESS_IVFFLAT_PHASE_SAMPLE:
+			return "sampling table";
+		case PROGRESS_IVFFLAT_PHASE_KMEANS:
+			return "performing k-means";
+		case PROGRESS_IVFFLAT_PHASE_SORT:
+			return "sorting tuples";
+		case PROGRESS_IVFFLAT_PHASE_LOAD:
+			return "loading tuples";
+		default:
+			return NULL;
+	}
+}
+#endif
+
 /*
  * Estimate the cost of an index scan
  */
@@ -174,7 +203,7 @@ ivfflathandler(PG_FUNCTION_ARGS)
 	amroutine->amoptions = ivfflatoptions;
 	amroutine->amproperty = NULL;	/* TODO AMPROP_DISTANCE_ORDERABLE */
 #if PG_VERSION_NUM >= 120000
-	amroutine->ambuildphasename = NULL;
+	amroutine->ambuildphasename = ivfflatbuildphasename;
 #endif
 	amroutine->amvalidate = ivfflatvalidate;
 	amroutine->ambeginscan = ivfflatbeginscan;
diff --git a/src/ivfflat.h b/src/ivfflat.h
index c7576d4..7d39c84 100644
--- a/src/ivfflat.h
+++ b/src/ivfflat.h
@@ -27,6 +27,13 @@
 #define IVFFLAT_DEFAULT_LISTS	100
 #define IVFFLAT_MAX_LISTS		32768
 
+/* Build phases */
+/* PROGRESS_CREATEIDX_SUBPHASE_INITIALIZE is 1 */
+#define PROGRESS_IVFFLAT_PHASE_SAMPLE	2
+#define PROGRESS_IVFFLAT_PHASE_KMEANS	3
+#define PROGRESS_IVFFLAT_PHASE_SORT		4
+#define PROGRESS_IVFFLAT_PHASE_LOAD		5
+
 #define IVFFLAT_LIST_SIZE(_dim)	(offsetof(IvfflatListData, center) + VECTOR_SIZE(_dim))
 
 #define IvfflatPageGetOpaque(page)	((IvfflatPageOpaque) PageGetSpecialPointer(page))
@@ -175,6 +182,7 @@ void		IvfflatCommitBuffer(Buffer buf, GenericXLogState *state);
 void		IvfflatAppendPage(Relation index, Buffer *buf, Page *page, GenericXLogState **state, ForkNumber forkNum);
 Buffer		IvfflatNewBuffer(Relation index, ForkNumber forkNum);
 void		IvfflatInitPage(Relation index, Buffer *buf, Page *page, GenericXLogState **state);
+void		IvfflatUpdateProgress(int64 val);
 
 /* Index access methods */
 IndexBuildResult *ivfflatbuild(Relation heap, Relation index, IndexInfo *indexInfo);
diff --git a/src/ivfutils.c b/src/ivfutils.c
index f3a2cf9..1cb5b1e 100644
--- a/src/ivfutils.c
+++ b/src/ivfutils.c
@@ -4,6 +4,16 @@
 #include "storage/bufmgr.h"
 #include "vector.h"
 
+#if PG_VERSION_NUM >= 120000
+#include "commands/progress.h"
+#endif
+
+#if PG_VERSION_NUM >= 140000
+#include "utils/backend_progress.h"
+#elif PG_VERSION_NUM >= 120000
+#include "pgstat.h"
+#endif
+
 /*
  * Allocate a vector array
  */
@@ -174,3 +184,14 @@ IvfflatUpdateList(Relation index, GenericXLogState *state, ListInfo listInfo,
 	/* Could only commit if changed, but extra complexity isn't needed */
 	IvfflatCommitBuffer(buf, state);
 }
+
+/*
+ * Update build phase progress
+ */
+void
+IvfflatUpdateProgress(int64 val)
+{
+#if PG_VERSION_NUM >= 120000
+	pgstat_progress_update_param(PROGRESS_CREATEIDX_SUBPHASE, val);
+#endif
+}