Why doesn’t PyGame draw in the window before the delay or sleep?

I am working on a pong game. When either of the scores hit 10, it is supposed to put up some text on the screen and say the right player has won or left player has won. However, in my program, it isn’t working. When it has to show the text that the right or left player has won, it doesn’t show it. But it works for everything else. Here is the code: