Check Download Progress on the Mac App Store
Outside of watching the little progress bar on the downloading apps icon in LaunchPad or the Dock, there isn’t much of an outward display of how downloads are progressing from the App Store. Instead, more specific information is contained within the Mac App Store app itself, and here’s how to see it:
From the Mac App Store… click on the “Purchases” tab and find the app(s) you are downloading. This will show you the download progress and time remaining until completion.
This is the same in Mac OS X 10.7 and 10.6.
Somewhat disappointingly, it doesn’t show you the actual download speed but you can always obtain that information elsewhere manually.
What About Download Speeds? You can check the download speed through the Mac App Store, this is done by clicking on the progress bar. Thanks for the tip Henry!