Information
Microsoft pointed out again yesterday that the Windows 10 21H2 (19044)
will receive the last security-related update in June 2023 for the consumer versions (Home, Pro, Pro for Workstation and Pro Education).
The non-security updates have already been discontinued.

Anyone using a business version (enterprise, education) will automatically receive updates via Windows Update until June 2024.
The Windows 10 21H2 LTSC will make it to January 2027 and the IoT Enterprise to January 2032. So there's still a while to go.

Those who are still using Windows 10 21H2 can easily switch to Windows 10 22H2 with KB5015684.
As a result, the consumer versions will then automatically receive updates until May 2024. The business versions will then be secured until May 2025.

Microsoft recommends upgrading to Windows 11.
But those who have not yet switched will certainly continue to use Windows 10 for as long as possible.
https://learn.microsoft.com/en-us/windows/release-health/windows-message-center#recent-announcements