At present it is 63-65 degrees. The knee feels tight and warm, I ice as much as possible. Should I be at 90 degrees already
Let the PT folks obsess about the numbers; that is their mindset.
As for where you should be right now---you are where you are---there is no schedule set for recovery other than the one set by your surgical knee. It will dictate where you should be and when you progress.
If you set up a schedule for recovery, or allow somebody else to do so, you will only set yourself up for disappointment. The knee sets up the schedule, and we just go along for the ride.
The knee feels tight and warm
That is because it is busy healing. Keep icing and elevating as much as possible---get the "Toes above the nose" and ice and elevate for long periods of time.
Ok, I will be a week out officially this afternoon.
You are very, very early in the grand scheme of recovery, and your knee is still reeling from the surgical trauma brought about by saws, files, pounding, etc---so just take it easy and let the knee heal and rest.
There is plenty of time to get to that destination called "fully recovered"---but there is no "window of opportunity"---do not let the PT folks bully you into thinking that.
Recovery from a TKR can take upwards to a year---so you just have to be patient and not worry about "Where should I be." Just take recovery one day at a time.
I have no idea why some of these PT's think that after such a traumatic surgery, that you will get to 90* in a week. Do not fret, do not worry, you will get there when your knee is ready.