@Ramesh Durairajan , Welcome to Microsoft Q&A,Although the Internet Explorer 11 desktop application will go out of support and be retired on June 15, 2022, it will still not affect the use of IE Mode.
Therefore, the answer to the three questions you asked is all ok.
I think XuDongPeng-MSFT's answer is vey good, which answers it very carefulnessly and you can look at the following link:
Regarding End of Support for Microsoft Web Browser Control ActiveX
Also, Please refer to retirement FAQ to know more about details, such as win11 could use IE mode to use Active controls, IE mode will continue to be supported through at least 2029.
Hope my description could be helpful.
Best Regards,
Jack
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