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Hello. Thanks for your question.
This is not a normal recovery after a neuter. I would try taking the e-collar off first to see if it's just "e-collar paralysis." Some cats won't move with it on. Most cats will leave the neuter site alone, so they don't need a collar.
If his signs continue over the following hour, then I would get him rechecked. This could be from your vet (if they take calls) or an ER vet in the area. It could be a pain issue, but I would want to rule out an internal bleed, reaction to the anesthetics or even a urinary blockage. These can all be evaluated at the physical exam.
I hope this helps, let me know if you have any other questions.