Microsoft has now begun to automatically distribute the Windows 10 October 2018 Update (Version 1809) to all computers that are suitable for this feature update. On March 20, 2019, Microsoft has updated KB article 4028685 to announce that Windows 10 will automatically download the October 2018 update to appropriate devices when the automatic updates are enabled in the Windows Update settings. Further details may be found in kb article4028685.
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though the Windows 10 October 2018 Update (v1809) is still not yet available thru the "Semi Annual Channel" [SAC], according to the Windows 10 Release Information page, which was last updated March 19, 2019:
https://docs.microsoft.com/en-us/windows/windows-10/release-information