Besides the times, you can use the USCIS site to find other information, including the status of your case, the date for case inquiry, how to submit an online inquiry, etc.
There’s a simple tool for checking the status of your case or request. It asks for your Receipt Number to provide you the required information. (The USCIS provides a 13-character number for each application.)
On the same page as the processing time for your case, you’ll find the date for the case inquiry and instructions on when you should submit an inquiry.
If your case is delayed for some reason, you can inquire about it online from the following section. The same page also has links for making other inquiries, such as an inquiry for a missing message.
The USCIS encourages customers to use the online tools and resources for information. According to the agency, the case status tool provides the same information you’ll receive by contacting the center. However, if you have an issue that requires live assistance, you can call the toll-free number 800-375-5283 if you are in the U.S. or 212-620-3418 if you’re outside. The timings are 8:00-20:00 Eastern, Mon-Fri.
Another source of information is the online bot called Emma. Available in English and Spanish, the automated service uses the words you enter to show topics and she can also speak the written information.