What time of day does Microsoft Release patches on "Patch Tuesday"

I've tried my servers and they don't see the patches that Microsoft has released. Usually Windows Update automatically installs them on Wednesday, so it must be something late in the day -- yet I can't find this info anywhere on either the Wikipedia page or on Microsoft's site for Patch Tuesday. Anyone have authoritative source for the time of day they are released?

The wiki discussion page for Patch Tuesday laments this as well:

"What time exactly are the updates released? I never seem to notice them till wednesday, and I see nothing as of yet (14:03 UTC) today. --Zilog Jones 13:03, 11 July 2006 (UTC)")

Solution 1:

According to this page, they release them at approximately 10 AM Pacific time.