Good old method

Under Linux use

sudo kill -USR1 $(pgrep "^dd")

Under BSD/OS X/macos

sudo kill -INFO $(pgrep "^dd")

New GNU coreutils' method

Newer GNU dds (8.24+) have got an additional option

dd if=/dev/urandom of=/dev/null status=progress

Using pv

More advanced with the pv command and right from the beginning

sudo dd if=/dev/sdb | pv -s 2G | dd of=DriveCopy1.dd bs=4096

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