That's a brilliant result. Mine was 0.014 after my prostatectomy. I sadly needed salvage radiotherapy. My PSA has now fallen to less than 0.006, which, my oncologist says, is the lowest reading the machine in my hospital can give.
The medical team will be very happy, but they will also look at your starting point and whether you had positive margins etc in deciding what, if anything, to do next, which will probably be let's wait and see what happens.