I'm not a doctor by any means, but I've separated both of my shoulders multiple times and that's pretty much how it goes. The only time I've done anything beyond rest and then strengthening rehab exercises was when I added a torn rotator cuff and strained biceps tendon into the mix. There are more severe types of separations that can potentially require surgery, but the vast majority are of the type that is treated by rest and rehab.
As for football, he's either too late for the spring camps or has plenty of time to try to get into fall camp (although without being at spring camp you usually don't get invited to fall camp). From my experience a typical separation meant 2-3 weeks of limited strength/mobility, 2-3 weeks of rehab and then a bit of time to get back to full strength. After about two months I was pretty much back to normal, it was only a bit longer with the added rotator cuff issues. It's also something you can play with, although I don't advise it. I played half a season (and downed a couple hundred ibuprofens) with a separated shoulder and it's probably a big reason why it's become a recurring injury.
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