https://www.techradar.com/news/windows-10-spring-creators-update-reportedly-set-for-april-10-release

The public release of the so-called Windows 10 Spring Creators Update appears to be imminent, with Windows Central reporting an initial rollout date of April 10, citing anonymous sources. 

Simultaneously, the outlet’s sources say that Microsoft has signed off on the final Windows Insider Preview build of Redstone 4 – its internal name for the next big WIndows 10 update – as Build 17133. This means that Build 17133 will, barring any issues, be what Microsoft releases to manufacturers (RTM) for loading onto new products.