What is the in progress label under the for later tab for?
The "In Progress" label is an optional label for marking items that you are currently reading/listening to. Once you are done with an item, you could move it to the "Completed" label. Some like to use this to track what they are reading at any given time and also to have a date stamp reminder as to when the item was finished (which would also happened if you only entered the item as completed and hadn't had it under the "In Progress" label first).
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