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Good luck with the recovery!
I had the surgery for a major tear last year and the recovery isn't much fun. I don't know why my rehab was different, but I wasn't allowed to start PT until 4 weeks after the surgery. Starting the same week is a good sign.
Getting range of motion back is critical, so follow the home exercise plan they give you religiously. It's easy to cut back on it after it starts to feel better but that's a huge mistake. Range of motion comes back quickly and by then PT isn't really painful.
The other advice I got was to not rush back into any rigorous activity. Too much too soon could get you back on the table for another round of surgery.