If your MDX is shipped via Burlington Northern Sante Fe railroad, you can track it at www.bnsf.com using the last 8 digits of your VIN.
But, if it is being shipped via Union Pacific, you have to have the car number that your MDX is on, and to get that you have to make your dealer make some phone calls to UP and get the car number. Be persistent. They can do it if they are willing to.
Do a search on 'James Bond' for when I tracked my MDX.