The usual way to filter a power bi visual or report to just the current day is to add a calculated column to the model with dax using the TODAY() function, and filter on that. Typical example:
TodayQ = IF(Table1[Date]=TODAY(),1,0)
https://community.powerbi.com/t5/Desktop/Filter-by-today-s-date/td-p/150039
With streaming push datasets, calculated columns are not available. So what's another approach to achieve a live dashboard always being filtered to the current day?