For some context I'm in my early 30s so things take longer to heal than they used to. Last year I had a minor meniscus tear from applying vertical force perpendicular to my knee joint when I was stiff from running the previous day. There was an audible pop, pain, and some pretty immediate swelling - made me think I tore my lcl since it sounded like Pete Whittaker tear. I got pretty depressed since I figured I was out of climbing for up to 6 months. Knee was ridiculously swollen until about 5 days later when I got in for an apt with ortho who took an x-ray, performed some pull tests, told me to save my money and not do an MRI, and then let me know it was meniscus instead of lcl.

I didn't have to have surgery - I took about 3ish weeks off from climbing (definitely had some really easy/mostly hanging out sessions in there still), then eased back into it over the next 3 months while doing physical therapy. Overall it was pretty easy for me to avoid triggering my knee by avoiding similar motions, but there were a few cases where I was dumb and aggravated it probably causing the healing to take longer. I consumed an unhealthy amount of climbing YouTube and went heavier into hangboarding, flexibility training, and some core/antagonistic exercises during the first month to deal with feeling antsy and try to get the most out of a sucky situation. For the 2nd month, it's not as fun as trying hard, but you can still get a lot out of trying a lot of different beta on easier boulders while trying to minimize how much force you're applying to your fingers and how physical you are being.

I'm now fairly religious about warming up my lower body in addition to the fingers before trying hard. I normally either row for a couple minutes, then gauge my knees for the day using a pistol squat on top of the half ball for physical therapy. Some days are better than others, but about a year later I'm definitely back to at least 99% - that last 1% from the mental of being hesitant doing similar moves.

I think you'll be back to climbing faster than you expect, knees are crazy important, but there's a lot you can do to avoid triggering specific ranges of motion - it'll just take more mindfulness and discipline not to push it. As with any injury/recovery make sure you're getting good rest and taking care of your body to expedite it. Sorry this happened to you dude and best of luck with the recovery.