Apple has finally released the first major update to High Sierra today, macOS 10.13.1. It can be installed from the App Store. I have installed it and all seems to be running well. If it seems a little sluggish at first, just shutdown your Mac and start it up. Everything should get really snappy. It is very fast, gotta like that. There are also updates to iOS, tvOS, watch OS, you know the drill. All of these updates fix a lot of security issues among other things, I recommend installing them as soon as possible.