The Oracle user monitoring CRS (Clusterware) should have a correctly defined CRS home and permissions to run the crsctl exectable. Locate the
crsctl command is on the host and then add this to the OS user's path. Usually this is $CRS_HOME (as mentioned in the release notes), hopefully this has been defined in your path and profile. Often the "grid" user has better access than the "oracle" OS user.
Once complete, run the following command as the CRS agent user in the Oracle CRS instance to confirm that it works successfully
crsctl query crs activeversion| awk '{gsub("\\[|\\]","",$NF);print $NF}'