1ms to the cell tower. Even on fiber Internet there’s still single digit ms latency to servers in the same metro area. Only T-Mobile has deployed 5G SA (standalone). ATT and Verizon use 5G NSA (non standalone) which is a 4G control channel bonded with 5G channels so it has 4G latency.
if we go by useless endpoints, let's compare apples to apples.
on fiber network equivalent to cell tower will be probably splitter. i guess it has sub 1ms latency