The  press (tech and otherwise) is filled with grandiose claims of "zero latency". There is no such thing as zero latency in computer networks. Some new technologies -- 5G and Wi-Fi 6 -- may (and probably do) reduce latency. That reduction is only for that limited portion of the full end-to-end communications path that is carried on 5G or Wi-Fi 6.

In real life, a path between devices on a network is usually composed of many elements (which may change over time.) The name "Internet" itself means a network of networks. Usually 5G or Wi-Fi 6 will make up only a very small piece of the overall path. In addition to the network path itself there are many other things that contribute to the full end-to-end delay (and jitter, i.e. variation in delay) experience. This article describes these elements using the example of remote operation/remote-control driving of a vehicle:

Network Considerations for Remote Vehicle Operation