In my option we should have a new line above Transferred, something that documents the total on the cloud / total on the local disk. So, let's call it "Total":
The reason that number changes is the max back log parameter.
--max-backlog int Maximum number of objects in sync or check backlog (default 10000)
If you want to 'total' number, set it to something crazy high but it has to do all that first and it's uses resources (cpu / memory / etc ) so that's why it doesn't total it up from the get go.