https://www.bleepingcomputer.com/news/microsoft/windows-10-21h1-now-in-broad-deployment-available-to-everyone/

Microsoft has designated Windows 10, version 21H1 (aka the May 2021 Update) for broad deployment, making it available to everyone via Windows Update.

Windows 10 21H1 will be offered to all devices not configured to defer feature updates or affected by compatibility holds.