My son was skiing and was hit by a skateboarder.
He can be treated with shoulder sling
I have studied your case. Your son's x ray is suggestive of a minimally displaced fracture. It will unite well wih conservative treatment and there is no need of surgery. Fracture will be united in 4 weeks. After that he can remove sling and start physiotherapy like pendulam exercises.
I hope this answers your query. Let me know if you want to need any other information.