There's actually 4 file managers for harmattan, but I want to make one that fits all my needs So I've started to work on Filebox (a nice excuse to learn QML). N900's users may know this app.
What it does:
When it starts copying files, it shows a progress indicator in header. When copy process is done, it shows a notification. There's no messages for copy errors at the moment.
Scroll the list down to show the quick search bar.
File can be downloaded from here.