You have two status check sites:
1. CS Department Supplement http://apply.cs.utexas.edu/grad/. Here, you can check whether you have submitted all of the required application items and send reminders to your references. Your application must be complete here for the admissions committee to review your application.
2. GIAC MyStatus: https://utdirect.utexas.edu/apps/adm/mystatus/. This is the status check site for the Graduate and International Admissions Center (GIAC). GIAC verifies application information, test scores, residency and admissions GPA calculations/equivalencies. If you have questions about the information your MyStatus page, please contact GIAC https://gradschool.utexas.edu/admissions/contact.