Easiest way is to run a vehicle health report and then go to Sync My Ride and it will tell you if you have and upgrade available.
In your car it's in the MFT help menu. It doesn't say 3.5.1 or whatever. Says something to the effect of 11.30.12458 can't remember for sure. Also, if you search the forum it's on here numerous times on how to find this.