Another method to determine the Latest Cumulative Updates is to view the Windows 10 Update History page.
Windows 10 and Windows Server 2016 update history
This will detail the updates that appear in the Microsoft Update Catalog (ALL Releases)
OSBuilder Update Catalogs are generated from WSUS, so these will include the "Patch Tuesday" (B Release) and any On Demand Releases (Critical). C and D Releases can be added to OSBuilder using New-OSBUpdate, but at least consider that these are Preview Releases and probably should only be used for Testing, and NOT for an Enterprise Deployment, but that's your call.
Microsoft Admits Normal Windows 10 Users Are 'Testing' Unstable Updates