Thank you for speaking to this important issue Brenda. This was my first concern when inspecting this setup, and I still have questions about this.
If trying this approach for the first time in spring, best practice would be to commit to an inspection every 7 days.
9 days after the egg is laid, all three castes (worker, drone, queen) are capped, on average (as all BABA beeks know). A queen interested in splitting will tend to depart soon after queen cells are capped, so carefully inspect every queen cup.
As Brenda indicates, the good news is that inspections should go relatively quick and easy with this method.
Additionally:
1) setup bait hives early enough for the scouts (as Ang Roell pointed out last spring).
2) be ready to divide/split. If you only have room for one colony at your site, be prepared to give the older queen mother away in the split (mimic the division of a swarm).
These are general best practices for all but could be even more important with Single Brood Chamber method.
Mark