It will be 2 years in October since I had a reverse right shoulder replacement, and I am thrilled with it. I had an excellent physical therapist, did lots of daily home exercises, and was well healed by my 4 month check up. No more constant nagging pain day and night, and I have excellent reach and mobility, don't even think about it during the normal daily activities. Only my behind the back reach is limited to a short arc, due to the reverse of the ball and joint, but it's not all that different than my left arm which probably has a bit of arthritis, but is still ok so far.
I was in no hurry to get the rTSR, and very apprehensive, even though I had both knees done previously and they both turned out well. Probably decided to do surgery about a year after the original diagnosis, had treated my shoulder with cortisone a few times, but that quit working by the third shot. I think you will know when it is time to get it done. For me, the trigger for all my replacement parts has been some event with extreme pain for several days (over and above the daily nagging low level pain) that caused me to decide I needed to do something, because I was not willing to live with that level of pain, or threat of it recurring often.