According to WDWinfo, fireworks are at 10:00 pm on the June 9th. Assuming that's correct, there is a good chance you'll still be in CRT when they start. A typical meal takes about 75 minutes at CRT (in my experience), but there is often a wait to be seated.
You'll be able to see some of the fireworks from inside the castle. They dim the lights and pipe in the music. Not all tables have a good view, so that's something to keep in mind. If you've seen the fireworks before and are looking for a new view, then CRT is fun. If you've never seen them before, they're better from outside the castle.
This is the view from inside the castle: