My timeline:
Applied 9/20.
Conditional approval received 11/6 (<7 weeks).
No interview slots were available in the Seattle/Vancouver area until 2015, but I kept checking back until I found an opening in Seattle on November 21.
I'll need to visit a Canadian NEXUS site for the iris scan. Do I need to wait for the card to arrive before visiting one of them? Or can I go as soon as I've received the approval notice following the interview?