How to MAKE SURE MY IPHONE IS UPDATING TO OIS7?

This is what happens when i plug my phone into the computer and open itunes…
I get a small pop up box that is labled iphone software update… And inside the box it says contacting iphone software update server; and there's a bar scrolling… Like something is trying to load. Is my phone udpating. My actual phone device says nothing. How do i know if it's working?

Your phone isn't supposed to say anything. I updated both my moms and brothers phone to iOS7.It will be updating soon don't unplug it or anything.