What are our pricing options for OMS to for Windows 10 upgrade analytics? (We have SA already)

In order to learn about the telemetry leaving the systems for Upgrade Analytics I would start https://docs.microsoft.com/en-us/windows/configuration/basic-level-windows-diagnostic-events-and-fields.

The more complete answer is this: Depending on your scenario, there are slightly different sets of data leaving your machines. 

1) If you want to use Upgrade Analytics to upgrade Win 7 and 8.1 machines, we document the data we send https://go.microsoft.com/fwlink/?LinkID=822965(we refer to it as CommercialDataOptIn)

2) If you are using Upgrade Readiness for Win 10 to 10 upgrades, your machines have to be at basic telemetry level (https://docs.microsoft.com/en-us/windows/configuration/basic-level-windows-diagnostic-events-and-fields). You can get some extra data (mainly usage) and use other Windows Analytics solutions by going to Enhanced Telemetry, which is documented https://docs.microsoft.com/en-us/windows/configuration/windows-diagnostic-data.