Hi Vicky! Thanks for stopping by to visit us on your way to see Cinderella. You don't want to keep Her Highness waiting, so let's make sure you make that reservation!
A meal at Cinderella's Royal Table is one of the highlights of a Walt Disney World vacation. You'll enjoy meeting the Princess and her entourage as you feast on a meal fit for royalty. Since your reservation time is before park opening (provided there are no morning Extra Magic Hours for on-site Guests that day), you can take advantage of a nearly empty Main Street, U.S.A. for some amazing pictures of Cinderella Castle before the crowds arrive.
Normally, we plan for about 30 minutes or so from the time we park the car until we're touching our MagicBands to the Mickey head to enter the Magic Kingdom Park, so I'd suggest hitting the parking lot no later than 7:45 a.m. on the day of your reservation. After you park, you'll need to take the parking lot tram to the Ticket & Transportation Center, and from there board the monorail to the park entrance. Once there, look for a Cast Member who will verify that you have an early dining reservation and allow you into the park.
Late June is a busy time, and you may find longer wait times for the trams and monorail if many Guests arrive early in anticipation of the park opening. I'd err on the side of being early for your reservation and try to get in as soon as you can.
I hope this helps you enjoy your royal visit with Walt Disney World's most famous Princess, Vicky. Please stop by again if we can offer any more advice.
Have a magical day!
Kathy K.