View Time Machine current status

Back when I had Mountain Lion I was able to run a shell script to view in real time, what specific file(s) Time machine was backing up at that moment. Here is the command:

<code>

sudo dtrace -n 'syscall::open*:entry /execname == "backupd"/ { print ("%s", copyinstr(arg0)); }'

</code>

Long story short, I lost the script and just found it. Now when I try it, all I get is a scrolling window of errors similar to this:

dtrace: error on enabled probe ID 7 (ID 151: syscall::open:entry): invalid user access in action #1 at DIF offset 24

I have been searching the net for hours and can't find any help with this. Any ideas?