Along with iOS 12.1 being released today, Apple has also released MacOS Mojave 10.14.1. Representing the first major update to Mojave since its release last month, this new build brings a number of improvements along with new Emoji and Group FaceTime.
The update is available now and you can download it by going to Settings>Software Update. The update is 3.3GB in size so set aside time to download and install it. As usual, you will need to reboot your Mac in order to apply the update after you have downloaded it.