This example will show an ASCII progress bar with information about speed of the I/O. When dd will finish it will keep showing the results.
# dd if=/dev/urandom | pv | dd of=/dev/null
below example will use a nice dialog with the message between quotes
# (pv -n /dev/uramdom | dd of=/dev/null bs=128M) 2>&1 | dialog --gauge "Running dd command (cloning), please wait..." 10 70 0