Well, I received my conditional approval yesterday (1/22) after applying on 1/10. Overall, it fits into the "about 10 days" turnaround time.
Now, the letter says that I should get iris scans if I plan to use NEXUS for air travel (which I do), but it doesn't say which locations have the iris scan. On the CBP website, it says iris scan is no longer operational in the US. Does that mean I have to go to a Canadian center to get an iris scan?