For interview date in Chicago, I think it will be a while. One of the person I know filed from Minnesota and haven't heard anything for last one year. So, if you are local to Illinois, it will be sooner.
As for EAD, it usually takes 30 days but at worst case, it can take up to 6 months (like in my case where my signature was little big which resulted in a hold and RFE). So, relax and try calling the USCIS and ask for an update. You can open a service request if it crossed 30 days since you filed.
For your information, 30 days if its an asylum case and 90 days if its other kind of EAD.