Mail Services has just picked up half of the letters. They should have the other half loaded in their truck within the next ten minutes. From there, the letters will be sealed and metered (stamped) by machines in Mail Services. After that, they'll be put into the U.S. postal system.
I took plenty of pictures as the letters were being loaded...
I can't predict when your letter will arrive. After all, you probably know how the mail works in your area better than I.I've written this before, but I should repeat it. Waitlist and deny letters are sent in standard, #10 envelopes. Admit letters are in slightly larger envelopes, so you will probably know the news inside as soon as you see your mail.
Good luck, everyone! See you at 6 PM!