I've yet ( hopefully never do) have a serious knee injury.. I tore my MCL in both knees 2 years ago and had surgery on both knees. and was riding probably a few months after. My surgeon dont me that i couldnt damage anything she had done so to go at my own pace and push myself. So I was skating like a month after and riding a few months.
Your injury looks way worse than mine. Just follow your therapist workouts and you'll be fine.