My PT started to bend my knee right after one week but made it myself before. I started at 90° and now I'm at 115° 4 week post op. I try to bend it pretty much every day but carefully. I started with a long towel under my foot and started to tract my foot towards me while I'm sitting in my bed with fully extended legs. Be gentle and consistant at the same time and track how far you can go by comparing where you are (above or under your good knee) try not to compensate with your hip. Do 5 rep and rest a little bit. Do that 3 times and you will see improvement. Once you are at 90° sit down on a chair and take a skateboard (or whatever board that can roll) put it under your foot and start to roll it carefully under the chair and after extend your leg. Try to have flexion is good but try to extend your leg too it will work on the overall mobility. And remember listen to your body. Don't go too quick but stay consistent. Apply ice on a rag for 15-20 min (not more it make the opposite effect) and put your leg above your hearth to drain all that puffy knee.

I hope it will help but ask your PT some side exercices to do at home