Hi Kahfi1,
thank you for posting on the Microsoft Community Forums.
For Windows Server 2016, the mainstream support ended on January 11, 2022, and the extended support will end on January 12, 2027.
For Windows Server 2019, the mainstream support is set to end on January 9, 2024, and the extended support will end on January 9, 2029.
Here is the link about the lifecycle of Windows Server 2016: Windows Server 2016 - Microsoft Lifecycle | Microsoft Learn.
Here is the link about the lifecycle of Windows Server 2019: Windows Server 2019 - Microsoft Lifecycle | Microsoft Learn.
Hope it helps.
Best regards,
Lei