well that is good news - it was perhaps his ALP that they were measuring, an indicator of whether there is lots of bone growth going on. Are they still going to do another scan though?
Depending on the results still to come in, he may be advised to see an oncologist as well as a urologist. Some men are suitable for surgery with a T3a while others are recommended to have one or more forms of radiotherapy; it would also be affected by any other medical conditions that he has. All you can do for now is wait to see what comes next Monday - update us as soon as you have any more details. Do you know what his PSA was?