RD decisions have lately been timed with the Ross BBA decision dates, which are the following Fridays: 2/18, 3/18 and 4/15. Pre-Pandemic, the RD decision dates were Fridays on or about 2/1, 3/1 and 4/1.
Typically, the first RD date in February is all acceptances. The latter two release dates increasingly have more waitlisted and rejected applicants.