He won't be skating at 3 months, that's just at the end of the danger period where the graft is at it's weakest point. It's 6 weeks to be walking unobstructed, then approx 4 months to rebuild the muscle wastage for a pro. That's best case scenario if he is weight bearing after surgery, if he's done meniscus damage then he's 6 weeks non weight bearing before he can even start a recovery.
He wouldn't begin to skate until at least the 5-6 month period depending on if it's considered a closed or open exercise, I'm not an expert on skatings impact on acls, but there's just so much stuff the body has to reprogram to learn how to operate in it's new configuration that just takes time, and pro athlete or not you can't speed up the body's healing process. He's in no rush, a lot of the healing time is during the off-season so there's no need to push him, a november comeback would be a target, targeting a non contact jersey during training camp.
Source, I've been through an acl reconstruction