Update: Cumulative update KB4505903 (Build 18362.267) for Windows 10 May 2019 update aka Version 1903 is now available and you can download the stand-alone offline installer for the update.
It seems that Microsoft will soon push a new cumulative update KB4505903 (Build 18362.267) for Windows 10 May 2019 update aka Version 1903. This build was last released to insiders in the Release Preview ring.
Official download links have appeared for KB4505903 (Build 18362.267) now and one can use these to update their PCs to Build 18362.267.