If you placed your GM order through a dealer, they will be able to tell you the status of your order. You can also call GM Customer Care at 1-800-462-8782 to speak to someone who can check on the status of your order for you.
If you placed yourorder online or over the phone with GM, you will be able to track it yourself by logging into your account on the GM website. Once you are logged in, click on My Orders in the top navigation bar. From there, you will be able to see all of your past and present orders, as well as their current status.