We boarded in Genoa recently, the ship had docked around 7am, we got there about 10:15 just as they were starting up the YC tent, had about a 30 min wait inside in a small lounge area where we were checked in, then we were escorted onboard and our cabin was ready.
Assuming your ship docks at a similar time, you may find them not quite ready for you at 10am, but you should be able to board soon after.