Ended up being both a SLAP 3 tear AND a full thickness rotator tear, but despite issues with insurance covering PT and the therapist feeling that PT once every three weeks was perfectly a sound decision, he is doing pretty well. We moved him near his college, so he is now working with both a new PT (self-pay) and his trainer 5 days per week. They say he is ahead of schedule. I think he can begin to lightly toss a ball at 4m. Right now, its crucial he is careful, as re-injury can occur between that 8-12 week time frame. Goal is to get him back in time for the Spring season. PT is key, IMO. Can suggest that you invest in a wedge type pillow as sleeping was extremely difficult for 1st two-three weeks.
Good luck with your son's surgery. They say both labrum and rotator tears can end a ball players career, so make sure he listens to his therapist and does his exercises. I will update as my son begins to throw and/or bat and hope you'll do the same.