I got an email to complete the supplemental app a couple days after submitting on sophas. I haven't heard anything official since submitting the supplemental, but I reached out to their admissions office on Feb 3 and they said this when I asked about the status of my application "We will notify you when your application is “complete” in our system, at which point it will be assigned to our faculty admissions committee. I see you submitted your supplemental application on January 18 and we appreciate your patience as the process of applications on our end is manual." For reference I submitted on sophas Jan 14, received and submitted supplemental Jan 18, and got the email above on Feb 3.