I was in same situation. I have flight to catch tomorrow Dec 7th 2022 and today is Dec 6th and my OCI is with purolator now.Never mind everyone. The status got updated to "Original Documents Ready for Dispatch" just now. So, hopefully I get those back by Friday this week.
In my situation; We paid for return postage but BLS told that I need to pay postage again(3 days before) so make sure you have paid everything correctly by calling them and confirming with email: "brampton.p AT blsinternational DOT net" just to 100% sure.