PostGIS_GEOS_Version — Returns the version number of the GEOS library.
text PostGIS_GEOS_Version();
Returns the version number of the GEOS library, or NULL if GEOS support is not enabled.
SELECT PostGIS_GEOS_Version(); postgis_geos_version ---------------------- 3.12.0dev-CAPI-1.18.0 (1 row)