When the app is complete, the system would say "Your application is now complete for review by the admissions committee."
And yes, I guess Jan 15th was the date that your app was officially complete. It took time for the AO to check your transcript, etc.
Me as well. I submitted my app on Jan 9th, but it wasn't complete until Feb 18th. Someone who had the same timeline with mine last year got the admission on March 20th. So maybe we can wait... and pray lol.