Assuming their is no complications in terms of nerves, he'll be fine. I've broken my right hand 4 times and my left 2 times, it just takes time. Also, I realize he's a professional hockey player and people will say it's different, but at the time of breaking my hands I was a semi-professional in a certain sport which involved hands (I'm not going to say what because it always sounds big-headed which is not the point).
Not ideal he misses some of the season but he could be back as early as 4 weeks if it heals quickly.