Getting the software version is not obvious. You have to press the driver's side temperature up and down buttons and the defrost button all together for 5 seconds. That gets you into "dealer mode". From there you can get to the "Radio Part Information" screen. My car was delivered with version 17.37.29 but was updated over the air in February to 17.48.2a. I understand there is a later version 17.50.49 that recent cars were delivered with and that also can be installed by a dealer. I do not believe it is being distributed over the air, yet.
It is unlikely that you would get an update without you knowing about it. It does prompt you that an update is available and asks you if you want to install it and gives the opportunity to schedule it for a later time.
There are two numbers on the screen. One is boot version - can't remember the other.
Which number is the one that's updated?