Hi , @knsrinath
You can use this code to get the Monday:
if(equals( dayOfWeek(utcNow()) ,0) , addDays(utcNow(),-6) , addDays(utcNow(), sub(0, sub(dayOfWeek(utcNow()),1)) ) )
You can use this code to get the Sunday:
addDays( if(equals( dayOfWeek(utcNow()) ,0) , addDays(utcNow(),-6) , addDays(utcNow(), sub(0, sub(dayOfWeek(utcNow()),1)) ) ) , 6)
The result is as follows:

Best Regards,
Yueyun Zhang