Assuming you already have an ONVSL code from your dealer. From landing to Chicago can take another 2-3 weeks. So call it 3-4 weeks before you csn get your hands on it. Of cours it can take longer...
Chicago is served by the port in Baltimore, and it is 7-12 days sailing time from Emden (depending on the season and currents). If the vessel with your car left on Monday February 27, my money is on you getting a call from your dealer that they have the car sometime around March 16.