Depending on the route (you didn't mention), Virtuosa is a multi-embarkation ship i.e. passengers and embark and disembark at multiple stops on the route; most of MSC's routes in Europe are like this. Assuming your sailing is like this, you shouldn't have any issue staying on board a little longer. When I debarked in Barcelona, I was able to stay onboard until about 11am with no issues. We weren't asked to leave, our cards were still working and packages available for us.
If you're doing a single embarkation cruise, you'll need to leave by around 9.30/10am, shortly after the last group (on the list you've shared above) are due to leave when they'll call for the stragglers. From what I've seen, only the Canary Island route is a single embarkation sailing.
You should note that MSC is relatively unique in having multiple embarkations on a route. Most others only have one.