3 weeks post op shoulder surgery repair torn labrum & torn rotator cuff. Physical therapy started. Is popping and clicking normal after surgery?

Yes, don't worry. Not all popping and clicking is a sign of trouble. In fact, because of the swelling that occurs after most shoulder surgeries, it is common. Remember to ice, do gentle range of motion exercises and begin early strengthening as directed by you surgeon and carried out by your physical therapist. In time, the noises will resolve as you recover.
No. No, that is not really a normal postop complaint. Just make sure your surgeon is aware.