So it looks like, from the last few board dates, they are released the second-ish week of Feb. Last couple of years, people were notified via command that Tuesday with the PSDM dropping that Thursday-ish. I don't know how far out command is actually notified. There is new directive to let commanders or senior raters and MPFs know seven days in advance of the member, don't really know if it relates.
Edit: yeah, what Goddard said ^