Magical greetings, Letitia!
Congratulations on being an
Annual Passholder during Walt Disney World® Resort's 45th anniversary year. As an Annual Passholder myself, I have throughly enjoyed the extra pixie-dusted perks that have come along with this year's celebration.
When taking advantage of the expanded Annual Passholder dining benefit of 20% off, there is not a specific meal time, or time of day that you must dine to receive the Passholder discount; it is available for all meals, any time of day! Feel free to dine at your desired time, you'll still receive your extra magical discount.
Also, don't forget you'll need a photo ID and your Annual Passholder Discount card for proof of membership. You can also show a screenshot from your My Disney Experience App for proof of membership. That strategy has worked for me several times.
I hope this helps! Please let us know if you should have any additional questions. We are here to help you maximize all your Passholder benefits.
Faith