I'm now 30 months post TKR, stopped skiing for several years due to pain on lateral side of right knee. Surgery was done in March, played golf 7 weeks later. Had hoped to ski the first winter, Covid put those dreams to bed, but, my knee was healed well enough. Skied last winter, knee was solid, never a problem, however, I had a part time job in a gym and got great instruction on strengthening and stretching legs and body. I would highly recommend using TRX devices both before and after replacement. My coach gave me specific exercises to increase strength and knee flexation. I used phone to video her techniques and progression.
Prior, do strenghting as described above, I would concentrate on groin muscles as mine just screamed in the first few weeks of hobbling around. Stationary bike is good as that will be part of your rehab and helps cardio.
I asked my Doc about getting off opioids ASAP. He gave me a strong anti-inflammatory that I started 5 days post. There are downsides to this for some, was able to wean off quickly, but, they helped when flair ups occur.
My Doc wanted me to rest for first week w/o PT. Did a month, hit the benchmark for bending knee quickly. Ended PT early due to Covid concerns. My PT's experience is that most are about equal at 6 weeks even if in different rehab procedures. A prime goal was not to limp, I spent much time using a walker and concentrating of regaining a normal stride. Walk on soft uneven surfaces like grass to build strength in the small muscles that balance you. Overall, my experience and recovery was better than most.
One aspect of trying to ski at 3 months is do you have the leg flexibility to get into and out our your boots. Also, the vibrations from skiing on hard snow are stressful, I would use only narrow waisted short skis to start.
Best wishes for quick recovery, be cautious and smart.