The healing of the rotator cuff takes time and cannot be accelerated. The rehabilitation program is designed in a stepwise fashion to progressively allow more activity.
The goal is pain-free use and a functional range of motion of the involved shoulder but often the final ROM result depends on the preoperative deformity and chronicity of the arthritis.
The specific exercises the patient should perform depends on which phase of the recovery process the patient is in. Your surgeon will inform you which exercises to start and when.