Checking case processing times for N-400 is similar to the adjustment of status. You’ll see that your case is pending at the National Benefits Center. Because you’re going to have an interview scheduled as part of your immigration naturalization process, you’ll have to use the field office that’s closest to your home.
First, go to https://egov.uscis.gov/processing-times/.
Select Form N-400 under the drop down menu.
Then find the office that’s closest to where you live. Select that location.
There isn’t a National Benefit Center and so, that’s where your interview would occur. When you press on Get processing time, you can see the estimate of how long it’s taking for interviews to be scheduled and to receive a decision on your naturalization case.