I ain't no doctor or anything like that, but my gut feeling is:

find a different sport for the rest of the summer. Like fast-walking. And keep spinning on the indoor bike...

Our shoulders and neck area work hard during cycling. A significant part of our weight is carried on our hands. It seems to me that cycling on the road or trail would seriously slow down, if not jeopardize, your healing.

I hope others have more enlightened advice to give though...

Good luck... I know it really sucks. My father in law, a long, long time cyclist, broke his collar bone (among other things) in a stupid but serious accident three years ago and was sidelined for a long time. It was really tough on him. He picked up bird photography...