Simpler still, download and use my free utility SilentKnight, which does all the work for you, automatically checking the firmware version against my online database, as well as checking that your Mac’s security data files are up to date, and more. If your Mac is running Mojave or later, then look here for recent Macs, or here for older ones. The other half of the information you need is something which Apple paradoxically doesn’t provide, a list of current firmware versions by model.
Of course that only tells you what version is installed, and not what it should be. Is your Mac’s firmware up to date? It’s simple to check: use the About This Mac command in the Apple menu, click on System Report… and, in System Information, read what it reports for System Firmware Version (in the Hardware Overview).
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