Return value from column based on today's date

Try this if you want to filter Sunday:

CalculatedBaseline =
CALCULATE (
    SUM ( Table[Baseline] ),
    FILTER (
        ALL ( Table ),
        Table[Date Series]
            = TODAY () + 7
                - WEEKDAY ( TODAY (), 2 )
    )
)

For Saturday:

CalculatedBaseline =
CALCULATE (
    SUM ( Table[Baseline] ),
    FILTER (
        ALL ( Table ),
        Table[Date Series]
            = TODAY () + 7
                - WEEKDAY ( TODAY (), 1 )
    )
)