I've frequently seen a few hours after, it's not updated, but I've seen once at 11pm est, it updated. What time does the Open Interest update on the option chain? Searches on Google and in this forum came up with nothing. Thanks!
I seem to recall it's at 4:30 pm but that's probably wrong. I only trust it at 9:30 am the next morning. 90 seconds before Morse comes in with the correct answer.
The OCC's website is usually updated between 9 and 10PM ET, sometimes a bit later on Fridays. I think the deadline for submitting exercise requests to the OCC is 5:30 or 6:00, but retail brokers like IB have a deadline around 4:30.