Need help on Ranking within table.

It really depends on what you're expecting as an output.

Assumptions for the below:

- I used your sample data and created a table called 'sample'

- I created a measure called _delay = SUM('sample'[Delay])

Create this measure, put it in the visual filters where it is 1.

__rank = 
VAR __locations =
    ALLSELECTED('sample')
VAR __ranked =
    ADDCOLUMNS(
        __locations
        , "__delay", [_delay]
        , "__rank", RANKX(
            __locations
            , [_delay]
            , BLANK()
            , DESC
            , Skip
        )
    )
VAR __top =
    TOPN(
        5
        , __ranked
        , [__rank], ASC
        , [__delay], DESC
        , 'sample'[Location], ASC
    )
VAR __isTop =
    CONTAINS(
        __top
        , 'sample'[Location], SELECTEDVALUE('sample'[Location])
    )
VAR __result =
    IF(
        __isTop
        , 1
        , 0
    )
RETURN __result

My code is GitHub Copilot assisted, but always tested.