I don't think NK was "announcing" anything. As in the past, we have been observing activity at the site where they conduct the nuclear tests.
They might still do their test in the upcoming days, or they might back down, or perhaps they generated the activity at the site to fool us into thinking they were readying a test.
They announced that they were “primed and ready”. Spying activity doesn’t give you a “Saturday”, announcements give you “Saturday”. This was all an exercise in control, they established that they can make half the world twitch with a press release.