T3 on its own does not indicate that curative treatment is likely - it will depend on whether he has any mets. Do you have the whole set of results which will be written as T3 N0 M0 or similar? If he is already on the hormones, there isn’t anything else that the oncologist would be doing at this stage - s/he probably wants to wait until later in August to see how well dad responds to the hormones. The fact that his PSA has dropped to 0.5 already is a good sign.