Hi, I just got my drivers license last week, and that I-797 receipt notice is exactly what they need to process your license. It's NOT the K1 I-797 but the one you recently received from USCIS after you file your AOS that states USCIS received your Application for Adjustment of Status or Permanent Resident. That's what the DMV goes by for proof of identity, then bring I-94 which states when you arrived here in US what visa type you entered US, your social security card, proof of address which is mail you received from the address where you live, your marriage contract in case you are using your married name, your passport. By the way I am still waiting for my EAD. And above are all what I brought to the DMV OHIO and then they process my license. Good Luck! I hope this help.