return list dictionary of the three biggest numbers in a list of dictionaries

def top_three(lst: List[Dict[str, int]], sort_key: str) -> Dict[str, int]:
    """Return the three largest items in a list of dictionaries 
    as a list of dictionaries.
    
    Arguments:
    lst -- list of dictionaries 
    sort_key -- key to sort dictionaries by
    
    Return: 
    sorted_lst -- sorted list of dictionaries
    """
    
    # your code here
    sorted_lst = sorted(lst, key=lambda x: x[sort_key], reverse=True)
    
    return sorted_lst[:3]