2 months sounds like a long time - but I'm not a doc! I would wait until it "feels" healed than do very a very light leg workout. I do know that your legs loose their mobility from non-use - so at least move them "all-around, full-range" with no weight and not in any position that bothers that knee.
You could work your "good leg" individualy on machines but don't put yourself in a position that compromises your recovering knee.
xcel