I applied for my wife's TRV from USA ( immediate family member of a PR)It depends on the time taken for Security clearance which is a part in Background Check.. Please keep posted if you get approved. I also have same timeline.
Timelines..
Submitted application: September 17th
Biometric information letter: September 18th
Biometric submitted: September 21st
Biometric correspondence letter: September 28th
Final decision: Awaiting....