In a nut shell, the program has been so popular that they are running out of commitment authority. With only 4 billion left across the nation, the balance of commitment authority will be more than used up by the end of the day. That’s why this will become a game of who gets their loan processed, approved, and then approved by USDA for your commitment while money is available. Locking in a loan does not guarantee anything.
What may also happen is that USDA could petition Congress to divert funds from another agency to keep the program going. As you can see, this will literally require an “act of Congress” to keep the program going. If not, funding will not be available until the new fiscal year begins October 1st.