I know, I know--"never leave your mill unattended when it's running." That's great advice and you should always follow it.
However, if you're going to disregard that for brief periods and want to be able to see on your iOS device how far your job has progressed (and if you have a Mac running Carbide Motion for example), you might consider a free app called Mocha VNC Lite.
There are several web pages with instructions (e.g.,
http://osxdaily.com/2012/10/18/vnc-from-iphone-ipad-to-mac-remote-access/ ) for setting up the app to mirror your Mac.
Once installed you can check on your iPhone or iPad and see that the 56th aluminum doily you're making is 87% complete and you'd better get back soon so you can set up for the 57th when the current job completes.
Of course, this is entirely theoretical since you should never leave your mill unattended....