The Activity table has the following fields: Id, AppId, PackageIdHash, AppActivityId, ActivityType, ActivityStatus, ParentActivityId, Tag, Group, MatchId, LastModifiedTime, ExpirationTime, Payload, Priority, IsLocalOnly, PlatformDeviceId, CreatedInCloud, StartTime, EndTime, LastModifiedOnClient, GroupAppActivityId, ClipboardPayload, EnterpriseId, OriginalLastModifiedOnClient, and ETag.
It contains as many as five fields for time tags: LastModifiedTime, ExpirationTime, StartTime, EndTime, and LastModifiedOnClient (this field may be empty and is filled in if the user modifies the file related to that particular table entry).
Paths to the executable files can also be found in this table: F:\\NirSoft\\x64\\USBDeview.exe.
In his article Windows 10 Timeline – Initial Review of Forensic Artefacts, Gary Hunter (pr3cur50r) stresses that values of time tags for deleted files do not change. As for modified documents, time tag volumes do not change instantly but within 24 hours.