They will when they're ready. Just as the girls laying eggs will happen when they're ready. I got the notification yesterday that the Invasion is 20 weeks now. No eggs yet, but Chia likely will any day now. Tuff has only been crowing for the last week or so (and sounds terrible so far)
Of course this also means that the ThunderStorm is 12 weeks. Nimbus is bigger (taller, rounder, not quite as long) than Lark and Indigo. The rest not yet. Storm is still hanging on to them, but they're spreading out more. I have witnessed ( in the last week) Storm attacking both Jessica and Pear (she actually squawked) for being too close to her babes. Twirp, on the other hand, is allowed in amongst them with impunity. T, J, and P are all above Storm in pecking order, but she seems to not care about it at the moment.
"Rules are more like guidelines"