Congrats with the new X3 and Phytonic Blue is the best color
I also own a couple of Toyota's so I think you are looking for something like 'Current trip since start' that mine also give current trip's gas mileage. No, I don't think this is a feature available in our X3. If this is important, you will have to do the trip odometer reset to get the info.
My X3 is also my first BMW and likewise, I enjoy every minute driving it. Enjoy the ride