Oracle Database patches are primarily released as quarterly Release Updates (RUs) in every quarter during the year, however oracle releases post-patches called MRPs that fix some bugs
that appears after the base patches (on top of RU’s).

Unfortunately, you can’t view/list the installed patches (MRPs) on your Oracle database binaries using OPatch utility, instead you will need to use AHF (Autonomous Health Framework).

Oracle Autonomous Health Framework (AHF) is a free, integrated suite of tools that autonomously monitors, diagnoses, and resolves potential availability and performance issues in Oracle Database systems. And, it get released on regular basis…so you will need to download the latest version.

The following command will list MRP’s installed on your Oracle database binaries:

ahf software get-mrp-level –oracle-home $ORACLE_HOME