How likely am I to get guarantee from USDA with an approved app with the underwriter?

I have been through the USDA home loan process. And it has been a process! But, through determination and several trips to the mortgage lenders office we finally have full loan approval through the underwriter. The package has been sent to USDA for the loan "guarantee". What are the odds that the USDA would deny the loan after the underwriter has approved it?

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