Hi there, Chad!
Depending upon the night you are dining at
Cinderella's Royal Table, you might have timed it right in conjunction with the fireworks. Check out the
Magic Kingdom calendar for specific fireworks times on the night you're dining in the Castle.
You will be able to see some of the fireworks if you are right up against the windows at the back of the restaurant.
Please be aware that there are only a handful of tables in that position, and you will not be able to see most of the fireworks that are overhead or to the right of the castle.
You will want to arrive early for your reservation to ask the Cast member for a window seat. These are not guaranteed; they are offered on a first-come, first-served basis.
Good luck - and have fun!
See you later, celebrator,
-Deborah B.