Apple has released iOS 12.4.2 for iPhone and iPad models that are still running iOS 12 but not supported by iOS 13 as an over-the-air update.
Apple announced watchOS 6 during WWDC 2019 conference and it will support all Apple Watch models, including Series 4, 3, 2 and 1.
Today, Apple has released iOS 12.3, watchOS 5.2.1, macOS 10.14.5 and tvOS 12.3 with the new TV app that was announced at the company's March event to everyone.
Today, the release notes of watchOS 4.1 GM were leaked that includes a list of new features, improvements and bug fixes coming to Apple Watch.
Apple has released watchOS 3.2 for Apple Watch with a few new additions, including Theater Mode, which will reduce the display's activeness.
Updating Apple Watch is different from updating iPhone because Watch OS updates are not done directly on the Watch. To update Apple Watch you need to pair it to the iPhone for internet Access and use the Apple Watch app for the iPhone App.