Ahoy there, Jennifer! Welcome aboard planDisney!
Ah, arriving more than 24 hours before your sail date? That's a planDrew-approved approach for sure! While my wife and I used to be the type of sailors who could throw caution to the wind and arrive the day of the cruise, now that we've got our little sailor to keep track of, those days have fallen off the horizon.
But enough about me, let's talk about you and your incredible Disney Cruise Line vacation from Miami - especially since you arrive...REALLY SOON!
Since you already have your Port Arrival Time from when you completed Online Check-In (look at you go, you Disney Cruise Line expert!) you already have all the details you need to reverse-Imagineer your Embarkation Day plans! Also, the Miami Airport is only eight miles away from the cruise port, and shouldn't take you very long to get there. (Though Embarkation days do tend to have a bit of traffic.)
You should also have had the opportunity to enter your flight information during your Online Check-In process, which also indicates to the Disney Cruise Line Crew that you will be arriving two days before embarkation. This is totally fine! I've done similar things when cruising out of Port Canaveral and staying in an Orlando-area hotel with no hiccups to speak of.
If it were me, I'd "budget" around 30 minutes of time before your Port Arrival time to get from Miami International Airport to the Port of Miami, depending on traffic. Since traffic is not something you can control, I'd personally bump that up to an hour.
With that settled, now the only unanswered part of your question was WHERE you should meet the Ground Transportation shuttle, which I'm excited to say is
outlined on the Ground Transportation page of the Disney Cruise Line website: baggage claim! Speaking of bags, since you'll likely be coming BACK to the Miami International Airport from offsite, be sure to remove all airline luggage tags and replace them with your Disney Cruise Line Luggage tags!
Once back at the airport, you'll look for a helpful Disney Cruise Line crew member who should have your party's information and will guide you the rest of the way! In my experience, these cast members are great at getting you where you need to go at the right time.
Oh, and one more thing!
Be sure you and your crew have all uploaded your vaccination records and any required tests to the Safe Passage website! You should be listed as "Clear to Arrive" or "Clear to Sail" before...well, arriving or sailing!
I hope that helps you plan a bit for your arrival in just a few days, Jennifer! I'm so excited for you and your crew to climb aboard and start making magical memories! Thank you for your question, and if you have any others in the short time before you arrive, please let me know here at planDisney - I'm always on the lookout for messages in bottles!
Happy sailing!
Andrew