Even my file is at Ottawa and we got pre-arrival on Oct 21st. But I don't think we will get DM anytime soon because PA still has pending biometrics due to closed VACs .I am in same situation as you.
PA is from India.
Feb 13th applicant.
Bio & Med done in March.
File Moved to Ottawa on September 3rd.
Received Pre-arrival letter on October 6th. Just waiting for final decision.