Update 2: Based on different dates listed on Apple's website in different countries, it seems the release window for iOS 14 is now between 11:30am-1:00pm Pacific / 2:30pm-4:00pm Eastern
Cupertino, California: 11:30 a.m. PDT - 1:00 p.m. PDT
New York, New York: 2:30 p.m. EDT - 4:00 p.m. EDT
London, United Kingdom — 7:30 p.m. BST - 9:00 p.m.
MacRumors.