You have PLENTY of time to get your tickets and luggage tags from your TA. Alternately, it will just slow you down a bit. You will have to manually fill out tags with the porters and will have to show documentation that you are, indeed, on the cruise in order to get through the first layer of security. WORSE case scenario is to call MSC and have them issue you the documents directly to your email. (Yes, they will balk because you booked with a TA, but you might insist)