A tear is a tear. Labrums don't heal themselves at all. PT beforehand won't improve your ROM after the surgery. Once the damage is done, improvements don't begin until the surgery heals. You won't be able to strengthen your shoulder or increase ROM while the Labrum and RC are torn. It just doesn't work like that. My advice is to stop using that arm virtually completely until the repair is complete and your OS tells you to start doing anything at all.