return the two biggest numbers in a list of dictionaries

def get_highest(list_of_numbers):
  two_biggest = []
  for num in list_of_numbers:
    if len(two_biggest) < 2:
      two_biggest.append(num)
    else:
      if num >= two_biggest[0]:
        two_biggest[0] = num
      elif num >= two_biggest[1]:
        two_biggest[1] = num
  return two_biggest

get_highest([1, 3, 5, 4, 2]) # [5, 4]
get_highest([1, 3, 5, 4, 2, 7, 8, 10, 9]) # [10, 9]