https://www.gamespot.com/articles/world-of-warcraft-battle-for-azeroth-launch-when-i/1100-6461130/

The next expansion for World of Warcraft is finally here. The Battle for Azeroth adds another chapter to WoW's story, encompassing a new campaign for players to fight their way through.

Battle of Azeroth releases globally for WoW today. In the western hemisphere, the expansion launches through the afternoon and into the evening. Those in the eastern hemisphere will get it overnight and into the morning, depending on the specific location. Here's exactly when it launches: