Use the status=progress flag as indicated below.

# dd if=/dev/sdd of=/home/sdd.img status=progress

Source: http://askubuntu.com/questions/215505/how-do-you-monitor-the-progress-of-dd

Note!
A working dd image of a linux system must be 127 GB or less in order for a vhd to work properly with Hyper-V.
Source: https://youfoobar.wordpress.com/2012/02/03/the-linux-p2v-into-hyper-v-conundrum/