Determining if your PeopleSoft Application can be upgraded to PT8.54
...and still be supported.
To find out, see document Lifetime Support Summary for PeopleSoft Releases (Doc ID 1348959.1) section Maximum PeopleTools Releases for PeopleSoft Applications.
The Applications / releases listed there are those that have reached their Maximum PeopleTools Release (MPR).
The MPR identifies the highest level of PeopleTools that Oracle has tested and certified for use with PeopleSoft application releases that have moved to Sustaining Support.
This doc also contains a section: Additional Information for Product Lines exclusively on Continuous Delivery.