Firmware updates would be found on the Minoston site - if they post any you can download them and install them via the HE Device Firmware Updater app, available on your hub. They also have a driver section there:
Can you share the model number of the plug(s)? You'll need that to look for FW updates and drivers on the Minoston site. If you're using a generic driver on Hubitat, switching to a specific Minoston driver from their site may get you what you want (power monitoring) if the device supports it.
Minoston plugs share hardware w/Zooz devices and can use Zooz drivers in most (all?) cases. I have a Minoston outdoor Z-Wave plug ( MP24Z) and I used it w/a Zooz community driver:
Zooz community drivers are here...might or might not enable power monitoring if the Minoston driver doesn't.