Can I get the application number immediately when I apply for a patent online?

If you submit it in person, you can usually get the admission notice and payment notice later, with the application number on it. If you submit it online, you may not get it on the same day. If you submit it early in the morning, you may get it in the afternoon, but there is no guarantee. If you want to get the application number in time, it is recommended that you submit it in person, but generally you can receive the acceptance notice the next day by electronic submission.