In your MINI with a MINI Controller and MINI system with a menu with displays in the form of tiles (ID6), you will find the installed version of the navigation map in the MINI system under: "Navigation" > "Settings" > "Position and version" > "Version info".
If you have booked the "Map Update" service for your vehicle as an individual service or as part of the option "Connected Navigation" or the option "Connected Navigation Plus" ex works or as a MINI Connected Upgrade from the MINI Connected Store, you can also find the installed version of the navigation map in the MINI portal under: "Vehicle overview" > "Map update".