Thanks, joro. I wouldn't like to worry about it, but I can't stop worrying. I don't know why he haven't submitted letters. Actually, when I asked him about submitting LORs a few days ago, I wrote him, "if you are uncomfortable, please let me know. I have to find another LOR writer." But he answered "of course I will do it on time."
I can't understand. I am from an east asian country, and have no experience with professors in the U.S. before. He suggested me that he would write LORs for me even before I asked. So, I asked him to write LORs when I completed applications. Is there anything wrong with me??