I have a very similar diagnosis (Feb 2022). I opted for radiation (39 sessions over 2 months). We assumed the enlarged pelvic lymph nodes were positive and they became part of the radiation plan. The PSA went from 80 to 1.2 (2months after completion of radiation). A later PSMA PET/CT. confirmed the LN's were positive but now greatly reduced.
I am now on Abiraterone (6weeks). PSA is now .4. Good Luck on this difficult journey.