At a certain stage, you will see large quantities of extra large lavae being produced.
These could simply be extra large supermajors, or alates (drones and/or queens).
The author’s largest colony first produced alates at or around the second week of April. This was when the colony was about 9 months old from founding date.
Following a heavy thunderstorm outdoors in the early afternoon, the alates left the colony on 1 May 2018.
The first batch of alates comprised almost entirely queen alates. Subsequent batches were fairly mixed with a slight slew toward queens. (Probably due to overfeeding)
Thereafter the colony produced new batches of male and female alates in approximately 2-3 week intervals.