I am nervous. I keep thinking if I forgot something in my application. This guy who posted two posts above had his letter delivered one day after me and has already got the email confirmation. Just getting anxious. This is not a fun process.
Don't worry or get nervous.
They have introduced a form called G-1145, E-Notification of Application/Petition Acceptance. I didn't know about it when I filed mine. Once you get your receipt, you would have chance to enroll online
Good Luck!