late May for benchmark/character creator download
The character creator is for Windows PC only, which is a bit of disappointment for console gamer like me. I won't be surprised if it would be a MS store exclusive in the global...
Late May could be anywhere from 18th-30th.
In original JP text, they say "下旬" which strictly means 21st to the end of the month.
If we further assume that the character creator will be released on the same day as the maintenance of PSO2, this can only mean 26th on JP, 26th/27th on global. Still character creator is supposedly a different application from the game, in might be released on some non-maintenance day.