On the computers page, there is a "last checked" column for devices monitored by the Vanta agent and MDMs.
Vanta Agent Devices
For devices managed by the Vanta agent, the last checked column will display the last time information was sent to Vanta from the device.
If the "last check" column is listing a more than 1 day of the last check in time, the device owner should run the Vanta doctor command to get the device to check in.
For device managed by an MDM, the "last check" column of the computers' page updates when a resource is updated or changed in the MDM. It will be normal to show the "last check" as more than a few days