Probably not until after the start of hostilities. Evacuating civilians would be tantamount to announcing imminent attack.
Trump would at the least be obligated to tell Tokyo he is going to pull the trigger, giving them time to evacuate Japanese. This of course will cause mass panic and US residents and others might storm their diplomatic facilities in Seoul or attempt to gain access to US bases asking to be air evac’ed out. That is my take at least. I doubt they can have them in harm’s way. One thing is for sure. Journalist or not, it is NOT a wise time to be in Pyongyang reporting on matters. They could take all those Westerners in a flat second as “human shields”.
What I am concerned about is the artillery, missiles aimed at Souel. My understanding is that the North could do a whole lotta damage real quick like.
My guess is that any attack will coincide with word from China that the little fat boy has either been killed or he is retiring to spend more time with his family.