How to find Min / Max in a column

I have a dataset in which daily receipts are recorded in the following fashion

Date / Customer ID / Receipt Number / Sale Amount

I want to find out which date had the maximum sales and which date had the minimum sale amount regardless of the customer.

My current flow is to use “Group By” to use Date as group column and sum(Sale Amount) in Aggregation. I have then used 2 Math Formula Nodes with the following conditions,

COLMAX($Sum(TotalSales)$) == $Sum(Total_Sales)$

and the other one is

COLMIN($Sum(TotalSales)$) == $Sum(Total_Sales)$

I have then used a Joiner class to merge the results.

My question, is there a simpler way of doing it?

TIA