It sounds as if you're 'in the system' now which is good as I fear the list is a very long one! Losing weight will also help with your recovery a lot when you do have a replacement.
I couldn't even get to see a consultant as my x-rays didn't show any sign of arthritis as my knees were collapsing the 'wrong' way! So, I paid for a private consultation and was told I needed a replacement urgently - and that wasn't going to happen, even pre-Covid! So I forked out for a private operation and it's very, very expensive! It did mean though that the same consultant did my other knee on the NHS without waiting on the list, so I got a bogoff.
Five years on, I now have two lovely new knees, can walk miles and climb stairs - and come back down frontwards. But kneeling feels like kneeling on a pebble beach so getting up off the floor, although no longer requiring two hefty firemen is still uncomfortable. Replacement knees aren't like you had when you were a teenager, but they are considerably better than the old collapsing ones.