Apple has released macOS 10.14.13, iOS 12.1.3, watchOS 5.1.3, and tvOS 12.1.2.
To download macOS 10.14.13, go to the Settings app and click Software Update.
You can download iOS 12.1.3 by going to Settings –> General –> Software Update.
You can install watchOS 5.1.3 by using the Watch app on your iPhone.
You can initiate the tvOS 12.1.2 update via the Settings menu on the Apple TV.