Have you been able to find a solution with Shopify? If not, I would recommend our app Better Reports.
We can create a report filtered for order’s current total price > 0 showing weekly total orders with their total value.
In addition to this, Better Reports has more than 60 built-in reports available out of the box that cover many common use cases for merchants. You can schedule reports to run at set frequencies to your email or Google Drive or export the reports in CSV, Excel or PDF format.
I encourage you to install Better Reports and start your free 14-day trial and I’ll be happy to set this up for you.