2.5 months is still the recovery time from most posts that I have read .IMO.
I would suggest you find some other activities to do for now and not go back heavy into the guitar yet.
I'm assuming they took the cervie rib out also?

lots of internal things got pushed and pulled out of the way during the surgery and it may take a year to fully know how it all it is doing.

You might look into Alexander technique or Feldenkrais to learn how to best use the body, many musicians do that esp after they had some injury.