It is not possible to rollback a patch once the cutover has been initiated.
If you've run adop phase=prepare,apply,finalize, then you can revert the Patch application by running adop phase=abort
But, once the cutover is initiated, there is no option.
This document helps when you can use abort to roll back and when you need to use backup to rollback clearly.
Hope this answers!
No its not possible to rollback the patch, unless you have taken the DB Snapshot before the apply phase.