I have check the status in the given link its showing the below status .
May 7, 2018
We received your case
Read the notice we mailed you for more information about how we will process your case
We will begin processing your case and will review it to make sure you have submitted all of the required information and documents. We will let you know if we need anything else from you.
If you do not receive your notice by June 06, 2018, send us a case inquiry and select that you did not receive your notice by mail.
If your mailing address changes, update your address with us.