You need a Wi-Fi connection to display this information after the Google Home app locates your unit.
On theConnect to Wi-Fistep, tap theMoreicon (three dots) on the upper-right portion of the screen.
Depending on your operating system, you may see this information at the top or bottom of the screen.

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Now make note of your equipment’s MAC address, which appears in a new dialog box.
From theFavoritesorDevicestab, choose the relevant gadget.
TapSettings(the gear icon) on the upper-right corner of the rig page >rig information.

Scroll down to the bottom of the screen and find your devices MAC address under the section labeledTechnical information.
How Do I Find My Google Home Mini MAC Address Without Internet?
Set up apersonal hotspot on iPhoneor theWi-Fi hotspot on an Android smartphone.

On theConnect to Wi-Fiscreen, select your mobile hotspot >More(three dots) >Show MAC address.
when you land the information, it’s possible for you to leave/cancel the setup process.
Can Google See My MAC Address?
This information is available to you in the Google Home app.
Beyond that, its not readily accessible outside of your web connection.
It’s possible totrace a MAC address with an IP addressto gather more information about devices on local networks.
FAQ
On a Nest thermostat, press the ring to reveal the Quick View menu.
Scroll toSettings>Technical info>web connection, then find your thermostat’s MAC address.
If you have a Chromecast with Google TV, selectSettings>System>About>Status>MAC address.