The Alchemist Guild has released iCloudStatus for Mac OS X Yosemite. It shows a status icon for iCloud Drive in your menu bar so there's no more digging around in the Finder to see when your files have been uploaded.

When you add files to iCloud Drive from the Finder or other apps iCloudStatus detects the changes and show you how much progress has been made, then notify you when the transfer is finished. Additionally a history log of all transfers and the date is recorded so you can verify previous activity.

iCloudStatus costs US$1.99. It's available here: http://tinyurl.com/osv59pk .