If you would like to see the total amount of payments made through sunday, follow these 2 steps:
1) From the dashboard, click the Accounting button on the menu on the left
2) Then navigate to the Revenues tab
3) Using the filters, enter the relevant period for which you want to see the total amount of payments
You will have an overview in this page of Revenue from sunday (i.e. total payments made using Sunday excluding tips) and Tips from sunday (i.e. total tips added to sunday payments).