You can find your customers' store statistics in Store management > Statistics.
You can view statistics for all your stores, or for one or more specific stores. You can also view statistics over a defined period.
Statistics include :
The number of sites created: corresponds to the sites created over the defined period.
The number of orders: corresponds to the total number of orders for the selected stores or, by default, for all stores created.
Total sales: corresponds to the sales of the stores you have created.
Average basket: corresponds to the average basket for the stores you've created.
Orders per store: represents the average number of orders placed in the stores you've created.
Finally, you'll also find the top 5 stores with the highest revenue.