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Things are handled differently depending on if your working with a Broker or a direct lender but it does sound like it was submitted in your case.
GUS or the Guaranteed Underwriting System is the (AUS) or Automated Underwriting System that the USDA uses...the lender would first run the "File" through the GUS system for an AUS approval before it's send off to the USDA, if you have a GUS approval then you should be fine.
Running GUS is part of the approval process for a USDA loan.
Thanks,