Latest time to arrive at Black Falcon and get parking?

I am preparing for my first cruise out of Boston. I will be departing on a Friday on the Norwegian Dawn.

I don't really care about being the first person on the ship, and am more than happy to get there after the mob scene.

With that being said, if I get to the port around 12:30-1:00, will I be able to find parking, or am I going to be pushing it?

I've read here on CC that there is overflow parking that never gets full.

Just as long as you are aboard 90 minutes ahead of sailing. That is when they close the manifest. Parking is no problem. The previous cruisers leave and the new ones fill the spots.

Thanks. I was just getting worried that my later arrival (by choice) would result in a parking issue.