Should be able to bike no problem. If you think that this surgery is meant to get even professional baseball pitchers back then is should be stable to ride. I'd follow your surgeons recovery protocol but by 3 months should easily be back on a trainer then slowly work up the mileage to outside on road, then dirt/cross then mountain bikes if wanted by 6-9 months. But follow your surgeons advice, I see no issues with getting back to that.