That's the right command, but there is likely nothing there right now.
I have not seen the WST in the GMOTD, but here's a link to the post:
Weekly Strike Targets
For easy access, I've also included the link and list in my signature below.
For what it's worth, I think it would be nice for non-forum-goers if it was announced in the GMOTD as well, but at least they included a link to it on the Updater page. 
When I type /gmotd, I get nothing, not even an error message. Am I using the wrong command? I want the global message of the day, which, as I understand it, will tell me which TF is the weekly TF for shardy stuffs.
"The one thing that can stop a full team of MasterMinds dead in its tracks... a doorway!" --Frogfather