Windows 10 LTSC version 2019 has an end-of-support date of January 9, 2029, while the LTSC version 2021 will have extended support until January 13, 2032. The end of support date for most other Windows 10 versions was October 14, 2025, but LTSC editions have separate, longer lifecycles.
Details at https://learn.microsoft.com/en-us/lifecycle/products/windows-10-enterprise-ltsc-2019 and https://learn.microsoft.com/en-us/lifecycle/products/windows-10-enterprise-ltsc-2021
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hth
Marcin