https://wccftech.com/insiders-begin-testing-windows-10-1809-cumulative-update-17763-346/

Microsoft released the second wave of Windows 10 cumulative updates for February earlier this week. While these updates were made available for various versions of the operating system, there wasn’t one available for the latest October 2018 Update. It appears the Windows maker is currently testing the Windows 10 cumulative update for version 1809 through its Insiders community.

The upcoming Windows 10 October 2018 Update build 17763.346 follows the release of build 17763.316 that was released on February 12, bringing a number of bug fixes. There are also four known issues in this build, some of which are likely to be addressed with the release of build 17763.346.