That's really nice Tobe, but can you add
labels to the individual task, the reason I'm asking is because we can't know the rough estimate time the task in the
Currently being worked on block are, same problem would be for the
Finished block!
You could just leave all tasks in a
TODO block, have another for
Up Next, and then
Currently being worked on or
Doing 
&
Finished, and you differentiate the tasks with labels, for your estimations.
I myself am a programmer / scrum master, so take this only as tips to help you organize your backlog (stuff to do)

Thanks and keep coding