I fail to believe that Windows Update has not updated, but it's a remote possibility.
On the main Windows Update screen under settings for Update & Security shows you precisely when the update check was performed:
and you can force it to check for updates now by clicking the button.
The Advanced Options screen shows the link to click to see what updates have already been applied.
Here's the first page of updates from my computer that are shown by clicking that link:
The only logical reason I can think of why Windows Update would not be automatically updating is if you have somehow set your internet connection as a metered connection. See this article for what this means and how to enable/disable/check the status of your internet connection.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134
. . . the presumption of innocence, while essential in the legal realm, does not mean the elimination of common sense outside it. The willing suspension of disbelief has its limits, or should.
~ Ruth Marcus, November 10, 2017, in Washington Post article, Bannon is right: It’s no coincidence The Post broke the Moore story