Biased post alert: The very, very, VERY best thing you can do is listen to your physical therapist's and doctor's recommendations.
Scenario 1: You do what you want(ski before you technically are cleared - because honestly this is what everyone wants to do lol) and risk getting hurt and then spend an additional few months recovering. To be brutally honest, sometime this WILL work out for you. Most other times it will end in you getting more injured. If it's a risk you're willing to take no one can stop you.
or
Scenario 2: You do what you can per therapist and MD recommendations, seek additional exercises(within reason) to expedite the process without necessarily rushing, and honestly taking it one day at a time and working your program. Maybe your ski season starts late but you will (more times than not) have more time on hill than scenario 1.
Vibes OP, you're in a shitty situation, but don't make it worse than it needs to be. I see people try to go back to activity too soon often, and they end up right back in not-so-great situations. Sometimes spending more time on recovering makes for more time enjoying x,y and z.