There will be some latency, but then they will travel at a very similar speed to the speed of light. That said the latency could be longer than the travel time. I remember reading a story once where someone had an issue sending emails further than 500 miles. Turns out there was a very fast timeout that was long enough for light to travel around 500 miles. Found it: https://www.reddit.com/r/sysadmin/comments/a6ay6j/the_case_of_the_500mile_email/