https://wccftech.com/microsoft-confirms-final-build-of-windows-10-21h1/

Microsoft has released what it believes will be the final build of the upcoming Windows 10 May 2021 Update, aka version 21H1. The Windows maker has confirmed that Build 19043.928 is the final build and has released the media for direct download.

"We are preparing the Windows 10 May 2021 Update (version 21H1) for release," the company wrote in a blog post. "We are continuing to improve the overall experience of the May 2021 Update on customers’ PCs through our usual servicing cadence." Microsoft has already released a fresher build for Windows Insiders in the Beta and Release Preview Channels with today's Build 19043.964. However, it confirmed that Build 19043.928 would be the RTM build.