Live dashboard using auto current date

I have a table with Locations( varchar)/Activitydate(Date)/Qty(Float).
I want to create a view for dashboard for Sum of Today’s Qty with Location. What criteria do I put in the builder , what is the syntax for creating where clause in such case ?

Also How do I create a table with single row single column with the current date which gets updated when it changes without editing the data table or just by refreshing the page. In that case I may use this table to join with above table to create the view.
Thanks for support.

If you use MySQL, you may read:
https://dev.mysql.com/doc/refman/8.0/en/group-by-functions.html
https://dev.mysql.com/doc/refman/8.0/en/date-and-time-functions.html