Just a heads up in case you're waiting for the update and not for another reason--the cooldown was changed to 10 minutes as of today--you don't have to wait for the March 19 build for it to be active!
There is a known bug with the tooltip, where it still reads one hour. But that is just an issue with the tooltip. The functionality of the actual item should be 10 minutes.
devtrackers.gg