What this tile shows
An operations number more than a sales one. A growing Processing pile usually means a packing problem, not a demand one.
Squizzie calls this one Orders by Status. It is a small table rather than a single figure, so it carries a few rows of detail on the tile itself.
Where the number comes from
WooCommerce Orders. Order data including revenue, counts, and averages.
What you need for it to appear
Nothing beyond Squizzie and the shop data it already reads.