I think it varies from department to department. Like all ITET guys have got a generic mail and their portal is updated. Similarly for your department, I think you are getting an official mail first and changes in the portal will reflect later. I don't think you should be wary about it.
Congratulations
I applied on 8th December. I do not think you should be anxious. They are not sending results based on who applied first. Many have still not had any form of communication. So don't worry and stay positive.