Hi al, The game does indeed have that feature for Super Neighbours. It is not accessed by way of the storage icon, but through the store itself. When you select the tool to plant, (when you are on your neighbours farm), you are taken to the store to select a crop. The "tool tip" for each crop, will tell you the amount of each crop , that your Neighbour has in storage, allowing you to select crops that you can see they need, as their total is low etc. To clarify, if you hover your mouse over each crop, in the store, it will give you your neighbours storage amounts.

I hope this helps