Xiaobaitu and other experts, please help!

I filed my 140 and I-485 at the same time,but 140 at NSC, I-485 at TSC.
Today i got a online status for 485: Current Status: This case has been sent for a standard interview.

On April 16, 2007, we transferred this case to our LINCOLN, NE location to conduct the interview that is a standard part of processing this I485 APPLICATION TO REGISTER PERMANENT RESIDENCE OR TO ADJUST STATUS. You will be sent a notice when the interview is scheduled, or if the office needs something from you. If you move while this case is pending, call customer service. We process cases in the order we receive them. You can use our processing dates to estimate when this case will be done. This case has been sent to our LINCOLN, NE location. Follow the link below to check processing dates. You can also receive automatic e-mail updates as we process your case.

my question:1:what the interview for? 2:the interview willnot be scheduled until 140 get approved?
I am EB3 based at CA, 140 still pending. thank you so much.