Aftermarket knees

I’ve needed two knees for probably over 20 years and keep putting it off and that’s one of my reasons. Between shop work, 7 cats, and racing I’m on my knees a lot. I just finished my third week of two shots of Synvisc today and my knees are killing me. I’ll probably have to take next winter off from
Doing porting work and start getting them replaced.
I have had joint juice injections in the past, they helped. This is a bit different then the "you need a replacement but" pain. I go see the doc tomorrow. I have been stretching consistently for over a year now. Pain doc suggested I get a Peleton bike, so I did. I am guessing that this recent flareup is probably just me doing to much to soon.
The orthopedic place I am going to has told me that they do have plenty of patients that have had both knees replaced and they go about a normal life. Doc told me that the no kneel/no squat is just a suggestion.
How long have you been getting the shots?