How to determine if a Dell system is no longer receiving BIOS updates?

Is there a Dell-maintained list or tool that shows which products are still supported with BIOS updates and which are no longer receiving them?

I’ve noticed that Dell has historically been very good about releasing BIOS updates, especially when addressing CVE-related vulnerabilities — even for older business models. However, consumer lines like Inspiron seem to stop receiving updates much sooner. For the systems I manage, if there hasn’t been any BIOS update in over a year, I usually assume support has ended, but I’d like a more definitive way to tell.