It is recovering. We had a period of ice and snow that caused me to miss three Physical Therapy sessions about a month after the surgery. I think that set me back, and I got to a point at the end of the scheduled sessions that the Therapist told me I'd be wasting my time paying him, and to just keep working on it by myself. The problem is that I can get the knee straight, but not past center. That means in doesn't "lock" when I am standing. It is slowly getting better, and I think it will turn out OK. I can put my socks on by myself, and trimmed my own toenails the other day, so I can bend the knee pretty well.
I couldn't stand or walk for long at first. By the time the therapy ran out (8 weeks) I could stand for a couple of hours before I had to sit down. After three months, I went to an event where I was standing and walking all day. I sat down for lunch, and other than that, I took three short breaks sitting down. It is improving slowly, but steadily now. I use an exercise bicycle and a leg lifting machine regularly, plus when I am in my recliner, I prop up under my heel and put a 4 pound sandbag on my knee to push it past straight until it gets too uncomfortable. That was suggested by the therapist. The exercise bike loosens up the knee, and is the first thing I do when exercising.
My wife had a knee replaced three years earlier, and I am progressing about the same as she did. If I forget to take the Tylenol, it isn't very uncomfortable. I was able to kneel on that knee pretty soon after the surgery, perhaps three weeks. Others say kneeling never came back for them. Both of us have numb areas to the outboard side of the incision, probably from nerve damage. She says hers got a little better with age, but is still numb. It took her about two years before she felt her knee was fully healed, but after two months, she was getting around fine. Both of us quit the strong pain medicine during the day after about a month and a half, but kept taking it at night for another month in order to sleep. If the pain doesn't get much worse when you are scheduled for the next pill, it is time to cut back on the strong stuff.
I was bone on bone by the time they scheduled me for replacement. I limped badly, and had lots of pain. I could walk without a limp the first time I tried it after the surgery, and climbed the stairs to the bedroom (22 steps) from the time I got home. The function of the knee was probably near 100% right out of the gate, but the swelling and trauma from the operation take time to heal. Everyone I talk to that has had a knee or hip replaced is glad they did, and wishes it had been done sooner! Me too.
Edit to add: I am glad I timed it like I did. I got Thanksgiving, then recovered enough for Christmas. Healing up during the cold and wet time of the year and getting around well in time for the better weather. I've been working in the shop lately, and I'll be able to get in a full day's work outside by the time the weather cooperates.