You will likely get OCI approval on 28th or 29th Sept. If you opted for courier services, you might not get it on time. I think collecting in-person might be best option here. You should connect with BLS if you can change the delivery option
Got my OCI approval yesterday.
Timeline:
Walk-in at Brampton BLS : Aug 8
Acknowledgment on OCI website : Aug 24
Document printing status - Processed: Sept 14
Dispatched from MEA : Sept 15
Received at Toronto: Sept 15
Hopefully I will have it in my hand by next week