Windows 10 will reach end of support on October 14, 2025. The current version, 22H2, will be the final version of Windows 10, and all editions will remain in support with monthly security update releases through that date. Existing LTSC releases will continue to receive updates beyond that date based on their specific lifecycles.
I'm picturing in my mind, that they'll add an overlay that takes up your whole screen on login after October '25 that'll just say "Upgrade to Windows 11 now!" That you can't close.