If that means September 7 (i.e, 3 days ago), your system is still on its way from China to Fedex.  Until it arrives in your home country, you won't see an active tracking link.  
I ordered 2 xps one for me and one for my younger brother, xps 13 got delivered in just 5 days while xps 17 shows still in production. I placed an order for xps 17 on 27th August and no status change. What major change is there to build 17 than 15/13 xps I am curious. No live status changes I can see but customer care agent says build completed on 2nd September, tho it's still not shipped. Not getting crazy but just curious why dell take time.  
XPS ORDER status