depends on how your dealer entered your info in their system as to if you get an email from GMC. the majority on here never received anything official directly from GMC during the build process while others received status updates along the way (similar to other brands). Guessing the dealer has to enter the buyer's info in a separate system or something in order for those updates to be generated.
ditto on getting updates from dealers - depends on how customer service oriented they are.
I'd contact GMC via their chat option online or call their customer service # with your order number. Could contact the dealer for sure, but I usually save those calls for something I can't obtain on my own