In case you haven't seen yet, you may want to check out Oracle Doc. ID 2251064.1, which details Oracle's announcement last week to provide Premier support of E1 version 9.2 through at least December 2030.
JD Edwards EnterpriseOne follows a Continuous Innovation model, where new functionality is delivered as updates to the existing release; upgrades are not required to gain access to newfeatures and capabilities.
If I am deciphering it correctly, then 9.2 update 0 premier support ends in 2028. However, if you stay current on the application updates (currently at update 2) premier will continue through at least 2030.