The official simultaneous worldwide launch of Overwatch is tomorrow, but that is as early as this afternoon in some territories. This post on Battle.net has the details on when to expect the release, which will be at 7:00 pm EDT, saying: "Similar to the Open Beta, Overwatch will launch in all gameplay regions across all platforms at the same time globally. To find out when Overwatch will be available in your region, check out the reference guide below."