@Parks Welcome to Recovery.
All you mentioned is normal.
Yes, there is a lot of talk about ROM, but please don’t stress about it. It will return to normal, but it will take time. Right now swelling, caused by the surgery, is preventing your knee from bending. That‘s normal. As the swelling goes down, and as you heal, the ROM will improve.
Regaining our ROM is more about Time than repetitions of a list of exercises.
Time to recover.
Time for pain and swelling to settle.
Time to heal.
Our range of motion is right there all
along just waiting for that to happen so it can show itself.
In the general run of things, it doesn't need to be fought for, worked hard for or worried about. It will happen.
Normal activity is the key to success.