When I run the CoreDataCloudKitDemo from:
https://developer.apple.com/documentation/coredata/synchronizing_a_local_store_to_the_cloud
It works but I get output in the debug area like:
CoreData: CloudKit: CoreData+CloudKit: -[NSCloudKitMirroringDelegate checkAndExecuteNextRequest]_block_invoke(2089): <NSCloudKitMirroringDelegate: 0x282248b00>: Executing: <NSCloudKitMirroringDelegateSetupRequest: 0x281b319b0> 5B0647D2-4D0B-4334-AF22-235A1FD29D03
2019-10-17 10:33:22.978576-0700 CoreDataCloudKitDemo[523:29722] XPC connection interrupted
CoreData: debug: CoreData+CloudKit: -[PFCloudKitMetadataModelMigrator calculateMigrationStepsWithConnection:error:](299): Skipping migration for 'ANSCKDATABASEMETADATA' because it already has a column named 'ZLASTFETCHDATE'
This is useful for tracking progress of the app but I have no idea where it comes from and whether I could incorporate any of this output into my app to appear to users to enable them to track the progress of syncing their core data to Cloud Kit.