Hi @Bonaire Max ,
Microsoft hasn't had a plan of when to end support for Edge on Windows 10 LTSC, but you can refer to a recent one that is applied to Windows 7 and Windows 8/8.1. You can expect that Microsoft Edge will continue to support a platform until its end of support. At least Microsoft Edge will deliver critical security fixes and fixes for known exploit bugs as long as Windows 10 LTSC receives the security updates.
Anyway, Microsoft will provide a minimum of 12 months' notification prior to ending support if no successor product or service is offered—excluding free services or preview releases.
For more information, you can refer to Modern Lifecycle Policy.
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Best Regards,
Shijie Li