A̶F̶A̶I̶C̶T̶,̶ ̶N̶T̶V̶ ̶i̶s̶ ̶r̶e̶p̶o̶r̶t̶i̶n̶g̶ ̶t̶h̶a̶t̶ ̶3̶m̶ ̶w̶a̶v̶e̶s̶ ̶h̶a̶v̶e̶ ̶j̶u̶s̶t̶ ̶s̶t̶a̶r̶t̶e̶d̶ ̶t̶o̶ ̶h̶i̶t̶ ̶J̶a̶p̶a̶n̶.̶
EDIT: Apologies, I misunderstood—a reply to this comment said they were just predictions. (I saw in this video[0] that the first waves had arrived, and assumed the heights would've therefore corresponded to actual measurements. But it's still in the "predictions" section, and I should've noticed that before posting....)
No. That's the predictions. Biggest wave so far has been 60cm (EDIT: as of 6am UTC it's 1m30cm, but that's still relatively small. It came up almost exactly to the top of the pier in Kuji.)
I've updated my comment, I indeed misunderstood what I read.... Unfortunately it's too late for me to delete the comment, so everyone please feel free to flag/downvote it (both to push it down for the sake of clutter, and also to punish my carelessness :-P).
No worries -- the way they present it is confusing, particularly if you're watching the NHK World stream, which layers poorly translated English versions on top of the Japanese.