“where the sun’s rays meet” is the first pun. The second was “where the son’s raise meat”.
What is the third?
A pun only requires wordplay on one word. “The dolphin did it on porpoise” is a single pun, albeit a really stupid one.
The punchline and its sound-alike (purpose/porpoise) are not separate puns, so you’ve counted the wrong thing. Here’s why it’s a triple pun:
1) sun’s -> sons
2) rays -> raise
3) meet -> meat
BTW, I didn’t say it was good, or funny, just triple. :)