Current week Highest /Lowest values

I use the below code to get the current days HHV & LLV values, how can I get the same for "current’ week

CurrentDayHighest = HighestSince(Day()!=Ref(Day(),-1), High, 1);                                                                                                                                                                              
CurrentDayLowest = LowestSince(Day()!=Ref(Day(),-1), Low, 1);

You can use this:

isStartOfWeek = DayOfWeek() < Ref(DayOfWeek(),-1);
CurrentDayHighest = HighestSince(isStartOfWeek , High, 1);                                                                                                                                                                              
CurrentDayLowest = LowestSince(isStartOfWeek , Low, 1);
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