I strongly suggest dragging the sled for 10-20 minutes light, doing bodyweight exercises (pushups, Fat Guy Pullups, lunges, back raise, squats etc) as LONG AS YOUR DOCTIR CLEARED YOU to exercise as tolerated.
Do this for a week or so and then check with PT on adding more in.

Rushing at this point is a terrible idea. Let your body acclimate to the training again and recover.