Permissions in terms of editing/deleting worklogs in ActivityTimeline copyJira permissions for these actions, meaning if user is unable to edit/delete his/her worklogs in Jira, he/she won’t be able to do so in ActivityTimeline either.
Main points:
Can I see Workspace of other users?
Yes, if you have Manager or Admin users role, you will be able to switch between workspaces of other users: