The train north is disrupted due to some cliffs collapsing recently - they have a bus service completing that portion of the route, but will cause delays. https://www.amtrak.com/pacific-surfliner-train
I got off the wonder in San Diego last month and it was a nightmare - low communication, long lines and mass lines. We were hours later than we expected, but the ship arrived basically on time. I wouldn't hold much hope for getting to LAX by noon, unless you have a hired car waiting for you at the port. I live in San Diego, FYSA.