Windows 10 20H1 2004 May 2020 Update was publicly released (to non-Insiders) to those manually hitting upgrade in Windows Control Panel on 27 May 2020. The Windows 10 2004 upgrade seemed to take longer than previous updates, 1 to 2 hours depending on laptop speed. The release notes show numerous new features including WSL2.
Don’t force upgrade
For devices with a compatibility hold, the Control Panel update page may have text like:
The Windows 10 May 2020 Update is on its way. We’re offering this update to compatible devices, but your device isn’t quite ready for it. Once your device is ready, you’ll see the update available on this page. There’s nothing you need to do at this time.
As with any Windows release, don’t force install a new Windows version unless it’s an extra device and you need the new features for development.