I had the same problem. I found that turning Apple Intelligence off fixes it. Or if you want to leave Apple Intelligence on, then turning on 'Summarize previews' for the app also fixes it. Basically, if you're not using Summarize previews with Apple Intelligence, then it's delayed for some reason. Hopefully it's just a bug that will get fixed soon.
Same thing is actually happening on the iPhone/iPad as well, which is how I first noticed it. My 2FA prompts from a few apps were coming in 5-10 seconds later instead of instantaneously when requested.