There is no firmly scheduled time, somewhere in the 0230 to 0330 GMT time window is likely:

Earlier previews:

Also, from morning press in Japan:

Adding this snippet from TD, in the no change camp:

  • Market conditions have improved in the BOJ's favour
  • Risk that the BOJ uses a review on inflation to signal optionality on policy changes in the future if conditions not met.
  • Forward guidance extended to the end of 2020, but this too is a close call