I had reverse shoulder replacement on my left side
You mentioned PT twice a week, how much do you do the exercises you learned at home? In between PT appointments I would do at least 3 hours of exercise everyday. Because I lost most my right hand in accident when I was young it was imperative that restore my left hand and as soon as possible.
Don’t expect just going to PT to bring yourself back to normal! You have to push yourself everyday at home. I went from surgery to complete usage, pain free in 6 weeks.