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Picture a 1m high wave with a crest to crest wavelength of 100km. That is pretty much what an open water tsunami looks like.

This is why when there's a tsunami warning, boats are supposed to leave the harbor, where it's dangerous, and get to sea where they won't notice the wave.

The disturbation will be less than 1 meter at open. The actual wave gains altitude only when it hits the shallow waters.

Yeah, no more than a bit of swell does though. Best example I can find is this -> https://youtu.be/ZS6EmSxncz4?t=78

There probably won't be 10m waves in the middle of the ocean. The waves will only be a few inches tall, but moving FAST. Then they get dramatically taller as they are forced to slow down in shallow water.

This is the North Pacific in Winter. I'd be surprised if there weren't 10m waves out there.

Well, those waves have nothing to do with the earthquake anyway, and they aren't traveling at the speed of a jet plane :)

It will absolutely affect boats in the Pacific.