Here's one way to tell, I think. The new nav and maps display not only the standard predicted state of charge on reaching your destination but also the predicted SOC on returning to the starting point.
On the new system, intersections and interchanges along your route are labeled in black-and-white lettering, but those at which you'll be turning will be in large blue lettering.
Finally, when your car has finished downloading the new beta nav system, you get a clear set of release notes on your touchscreen withOUT having had to interact with the car to start or schedule any further update. If you haven't seen that release note, which is hard to miss, you don't have "new maps."