It takes time. Every case is different. I saw Peter post surgery.
But don't forget that his is a progressive program. He doesn't give you all the exercises on the first day. It's good to believe that it's helping as opposed to questioning the therapy; especially when you are doing a course of PT so very well designed and working the very best! Remember, You are so lucky to have landed in the area that you have.You have access to excellent PT, classes, doctors and support groups.
I would explore doing the cardiovascular part of the program if you are doing so well. One thing that has helped a lot of us also living in the area is Ai-chi. It's done in a warm pool; you can check with your local YMCA to see if it's offered near you.
Other things you could add are Feldenkreis lessons or Qi-gong. You could ask Peter if he knows of any classes or practioners since he is usually pretty current and knowledgable. Another class that has helped is Qigong in the warm water, called Aqua-chi