A less than sign (<) on your PSA is always good. It means that it doesn't register at the lowest level the test picks up.
Hospitals seem to differ over when is a good time to start penile rehabilitation (= penis pump).. I can imagine that they might think it is a risk while things are still healing.
In my case, the specialist nurse in urology was very clear, she wrote a "prescribe this" letter to my GP at the appropriate time. You could ask at your appointment when they recommend doing it.