Did you receive an automated reply that it had been received? If so, you're probably fine, but are getting to the outside of the normal window for verification. They get a LOT of rides in the summer months, as you can imagine, so sometimes the verification teams have quite a backlog.
Just an FYI, while I suspect you are using IBR for Iron Butt Ride, that is more commonly used to refer to the Iron Butt Rally, a.k.a. The Big Dance, so you might want to clarify that you finally did that Certificate ride that you've been wanting to do! And congrats on making that happen. I hope you enjoyed the ride and process.
I understand the waiting anxiety. I myself did a SS1K, back in Sept '20, and am also waiting to see if it gets approved.
@Ira is the most active official IBA person on the forum that might be able to shed light on your cert.
@Howard Entman also does an amazing amount of work on certifications.