The current version of Windows 10 is v1803. Microsoft had a bunch of issues with v1809. It was initially released in October 2018. The initial rollout was stopped.
I ran Windows Updates on a couple of machines in the last 24 hours. Two updated to v1809. My PC did not. Figures.
I don’t know of any reason to not do the update. The problems seemed to be with specific brands of hardware and specific features. Hopefully, we are good to go.
A few hours after I posted this, I found an article by Paul Thurrott. He says that Microsoft has done a general release. The catch is that you have to manually run Windows Update.