For reference, in the unlicensed Ubiquiti gear that I've used, the point-to-multipoint latency is variable with the signal quality of the connected stations.

If all client stations have good, clear signals, the latency is around 1-2ms. But that can spike quickly if you're dealing with interference or other causes of low SNR.

That's something I'm curious about, too. I haven't done much research on it except to say I've used it a few times with no noticeable impact and some others are doing mesh networks. I was just curious if OP had done any research or analysis of that option.