I just tried a few minutes ago (around 4pm eastern) but got an error when I attempted to switch the mailing date to tomorrow. I'm just going to try again tomorrow and hopefully it'll work out OK.
As of 7/19/23 10pm Pacific Time, still not working. Error message says: "It was not possible to generate the label. Something is wrong. Please try again later."
I was able to print this morning (July 20, a bit after 6am Eastern) with no problem. My error was different. When I tried to change the date I got one of those "well, this embarrassing" error pages. I was shipping APO/FPO.