Hi @JPScolar,
Right now the best way to pull that information is via the API, /organizations/{organizationId}/uplinks/statuses. Assuming that the CP is always WAN 2, you would be able to parse out that information with a simple Python script. Same goes for embedded cellular.
Likewise, if you have a Meraki Insight License, you would be able to see that as well. Either a USB 3G/4G modem or built-in LTE (for MX67C/MX68CW only) will be detected as secondary, cellular. But for CP coming in over ethernet, it will just appear as another broadband link.
-jv