I know this response would be way late, but I was looking for something like this myself (hence why I happened upon this post). You can use bar (http://clpbar.sourceforge.net/
). The command for copying a file with a progress bar would then be
bar --in-file source.file | dd of=dest.file
. You could also make a simple shell script to make it easier, of course.
bar --in-file $1 | dd of=$2