1-2 ms is on the 5G roadmap but years away almost everywhere. 90% of "5G" before next decade will be at 3.5 GHz, with speeds almost identical to LTE. The Emperor has no clothes.
These figures are from Ericsson, which has been working on 5G since 2011. All Ericsson radios since 2015 have been able to switch from 4G LTE to 5G with software. (below) Nokia probably is the same or worse but I'm still waiting for the data. Depending on the upgrade cycle, LTE in some places will have lower latency than 5G at 3.5 GHz.
"From mid-2018 Ericsson will have support for latency (Round Trip Time, RTT) down to 9ms on the LTE air interface (Based on the 3GPP Rel-14)."