On the left our forerunner is already at 20 (growing about 6mm in two days) with the other 3 following a little behind at 15 and under and 1 more still less than 10mm.
They want me back tomorrow to take another look. The question is... Do we trigger tomorrow and waste all the little ones, or do we sacrifice the big one and trigger on Monday so we can reap the rest in their prime? We'll find out in the morning I guess. :/
Edited to add specific measurements:
Left: 20.33, 15.81, 15.20, 11.67