payampsf

Hi everybody, I lodged for visa 190 more than 2 months ago and yet received no contact from officer. Is it normal? How long does it take usually to have any kind of contact from them? besides, I have attached all required documents except health exams and evidence clearance since I heard that it would be better to send them after CO contact. Is it right? Does it make delay on our processing time? Do you advice me to complete and send them or wait for CO contact?