https://wccftech.com/kb4549951-windows-10-cumulative-updates-out-for-versions-1909-and-1903/

Microsoft has released Patch Tuesday updates for all the supported versions of Windows 10. Windows 10 cumulative updates are now available for the November 2019 Update, version 1909 (Build 18363.778, KB4549951), the May 2019 Update, version 1903 (Build 18362.778, KB4549951), the October 2018 Update, version 1809 (KB4549949 - Build 17763.1158), the April 2018 Update (KB4550922 - Build 17134.1425), the Fall Creators Update, version 1709 (KB4550927 - Build 16299.1806), the Creators Update, version 1703 (KB4550939 - Build 15063.2346), the Anniversary Update, version 1607 (KB4550929 - Build 14393.3630), and the original Windows 10 (KB4550930 - Build 10240.18545).

Microsoft added that today's release also brings "updates for Microsoft HoloLens (OS Build 18362.1057) released April 14, 2020," adding that the company "will release an update directly to the Windows Update Client to improve Windows Update reliability on Microsoft HoloLens that have not updated to this most recent OS Build."