The pathology on the biopsy can take up to two weeks to return. He would have a rough idea of the stage by the size of the tumor in the mammogram but unconfirmed until the results are in.
It did take a couple of weeks for my surgeon to answer the referral. My GP by then had a full body CT and a bone CT done while we were waiting and sent a copy of the results on to the surgeon.
Find your nearest McGrath nurse and she can perhaps hurry things along a little. https://www.mcgrathfoundation.com.au/get-support/find-a-nurse/