When you go to the device, and it says Firmware Up-to-Date, this simply means that the device is running the configured firmware for your network. This is as it should be. If you have configured, e.g. MX18.107.8 and it's running MX18.107.5, then the device would complain with "Not Up-to-Date", and would attempt to upgrade to .8. Once this happens the device would most likely be "Up-to-Date" again.
Now, if you go to Firmware Upgrade on your Org-Wide menu, and the firmware says Critical, this means the the firmware has reached its End-of-Support date, and is no longer supported, meaning that there may be security vulnerabilities or severe defects, that may need to be addressed.
If you are running a firmware that is Critical, it's recommended that you move away from that firmware version, to either a Stable or Beta release.
There's more info about it here.
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