What is the typical weight bearing progression after broken ankle (it required surgery). i will be using an air cast for physio?

It depends: It depends on the type of fracture and the surgery that was done. You should address the question to the doctor who performed the surgery.

Varies : It varies quite a bit based upon the nature of the fracture as well as type of surgery that was done. The “average” ankle requiring an open reduction and interval fixation takes about 6-8 weeks to heal, at which time protected weight bearing is often begun. Of course, you should discuss the specifics of your case with your surgeon.