Not acromion fracture, but close so might be of interest…. I took a similar sounding fall off my MTB a few years back and broke my left scapula into several pieces. Treatment after a&e x-ray was a sling and over the counter pain relief as needed. I assume Nat has a sling?
Pretty sure my first ortho appointment was over a month later they just did x-ray and checked mobility and told me to keep using the sling before sending me on my way. Only other treatment was a physio self referral a month or so later. If they are happy with the x-rays then conservative treatment is the norm I think?
In terms of outcome I was a less than model patient (me and the kids did an uplift day at bike park Wales three weeks after falling off, I rode gently…) and it healed fine, a bit achy for a while and slightly clunky for several months but no long term issues in particular.