https://www.techradar.com/news/windows-10-may-2019-update-may-be-coming-as-soon-as-this-week

We were expecting the May 2019 Update to kick-off at some point in late May, and it appears that it could launch this week, rather than next, if some relatively unusual activity in the preview builds of Windows 10 is anything to go by.

This is based on the fact that yesterday, Microsoft released a new build (18362.116) for testers in the slow and release preview rings, which included a fix for an installation failure bug, and an Edge and Internet Explorer-related issue that barred access to some gov.uk sites.