For IR1/CR1, you complete DS-260 through CEAC and upload all the required support documents. NVC will review your application and supporting documents. After that if you are missing anything, NVC will provide you a RFE (request for evidence) and you have to upload what they asked for. If NVC is satisfied with your documents, they will give you a "documentary qualified" (case complete).
When you're "case complete", you will get an email with the next step is to register for passport delivery (Aramex/SLS). I did mine and it only shows on bar code because DS-260 was filled already. Make sure you print the confirmation sheet with bar code and also the SLS email confirmation.
In the meantime time, NVC will work with US embassy in Cairo to schedule your date of interview and they will provide you a letter of when your appointment date and what to bring with you for the interview.
FYI I got case complete in February 9th and still waiting for my appointment letter.
I hope this helps