Hi Sarah and welcome to the Disney Parks Moms Panel.
Typically, the Park Schedules which include the times of Parades, Fireworks and other Nighttime shows are available to view on the Walt Disney World website for the current month plus the following 6 months.
At this moment in time, the Park Hours are available to view up to and including November 13, 2016. (An additional day will be added daily so, for instance, tomorrow you will be able to view the Park Hours for November 14, 2016.)
It doesn't look as though the times of the Parades, Fireworks and other Nighttime shows have been loaded into the system just yet but I would expect that they will be available to view in the next week or so.
My best advice to you would be to just keep checking the website each day to see if the Park Schedule for the Magic Kingdom park has been updated to include the dates and times that the
Main Street Electrical Parade will be taking place during your stay.
Wishing you a magical trip filled with memories which will last a lifetime!
Emma