I couldn't find this info easily - what time exactly (in what time zone) on the 15th will Rime of the Frostmaiden be available digitally for those of us who pre-ordered it on D&D Beyond? I know this may seem a bit silly, but I'm irrationally excited for the adventure and can't wait to start reading through...

i will gladly see answered the question above

Was curious about this myself. Hoping to see an answer soon!

I believe with previous  books it's been midnight PST

Great, thanks!

Hell yeah! I was looking for this exact thing. 
If anyone here is interested, though. I've been reading it via this https://www.youtube.com/watch?v=cyH6uIVPrfc&t=1261s

Great! Now I have an actual reason to stay up late instead of just not paying attention to the time! 

The official D&D Beyond twitter says that it'll release at Midnight EST!

I was going to say in the past it’s been 9pm PST...

So releasing in 1 hour 30 min? Cool

Seems it's up now!

Quote from O4OUR >>

Seems it's up now!

 Cooooooooooool It’s out

Wooooo!!

DISCLAIMER: THE WINDSWEPT TUNDRA OF ICEWIND DALE IS THE TRUE TEST OF ONE’S METTLE. HERE, IT’S SURVIVAL OF THE FITTEST! DON’T BE FOOLED BY THE REINDEER WITH GLOW-IN-THE-DARK ANTLERS AND THE TASTY KNUCKLEHEAD TROUT (INCLUDING THE FRIENDLIER, MORE NORTHERLY CANUCKLEHEAD VARIETY). ICEWIND DALE IS THE FROSTBITTEN END OF THE WORLD. YOU CAN’T SPELL DICE WITHOUT ICE, MY FRIEND, AND THE FROSTMAIDEN IS NOT SOME DEMON PRINCE, VAMPIRE, LICH, BEHOLDER CRIME LORD, OR ARCHDEVIL. SHE’S A GOD—AND A COLD-HEARTED ONE AT THAT.