Welcome aboard!
I am a pT3a also and I have PSA test every 3 months like you. I guess your doctor just wants you to meet with a RO to prepare for additional treatment should you need it down the road.
I was told to keep having the test and if my PSA climbed 0.2, I may need SRT. My PSA has climbed to 0.1 and stayed there for 1 year. So far you are looking pretty good with your results.
Bill from Florida