There is a special line for Suites and Pinnacles in front of the door into the terminal. It usually forms about an 1/2 hour to an hour before the doors open. You get priority check-in and then if the ship is not ready, there is a special waiting area for suites and Pinnacles that they should direct you too. I think they reinstated cookies and water now that Covid retractions have been lifted. Suites and Pinnacles check in and board before "The Key" that is a program that cruisers purchase to get priority check-in and departure other perks.
You will also have priority disembarkation with the Concierge leading you off of the ship. Your luggage will be in a special Suite/Pinnacle section.