That would be too late. Get him back with mama and do physical therapy there - assuming she's docile enough. Plan B: separate her while you're working on him.
Did the vet say why he's not getting up? You might want to try the Madigan Squeeze for a "dummy calf". Link below and there are tons of videos online. Another reason may be damage from pulling. Are his joints in place? Nothing looks broken?
Calves that have incurred traumatic births are often are lethargic, clumsy and have little interest in nursing. These babies may benefit from a simple procedure called the “Madigan Squeeze Technique.”
www.drovers.com