Hi Armando and welcome to the Mom's Panel!
Your trip is only a couple of weeks away now - I am so excited for you!
You can find out which days and times Wishes Nighttime Spectacular is showing during you visit by checking the park calendar for Magic Kingdom on the Walt Disney World website which you can find
HERE
Click on the drop down box under 'View Month', select February 2011 and click 'Go'
You can then click on each individual day of your visit and see a detailed list of times for shows and parades taking place on each particular day.
You will be pleased to hear that Wishes is scheduled to take place at 8pm every night from 18-25 February 2011.
I hope that you enjoy this fantastic fireworks show and wish you a magical trip!