Hard to see into the future.

That being said, here's my thoughts based on your clinical data.

If your PCa recurs, I venture it is most likely oligometastatic, low volume.
If imaging locates the recurrence your medical team may suggest one of two options...

If you don't want to do ADT, they may suggest MDT in the form of SBRT to the sites identified in the scan.
If you are ok with some ADT, most likely they may suggest SBRT for MDT and 6-12 months of ADT for micro-metastatic PCa. This course of action may bring a longer progression free survival period than SBRT for MDT only.

I do not see ADT for life given your clinical data.

Then again, by the time you face a decision, who knows what changes medical research has brought about!

In the meantime, enjoy your life!

Kevin