Alright, it might not be there all the time, but when do you need it? When you are checking to see if it is still working? If it's done, you don't care, you care if it is working or hung-up. But either way, if you want it back here is where to find it.
Note: These icons only show up when it is working on it in the background. Meaning, if it isn't there, it isn't working on it. If it is there, you can click on it and get the progress.