I'm with Homer on this. To carry it even further, that conduit hub on top of the meter socket is for threaded conduit only, not an EMT connector, SE cable connector or PVC male terminal adapter. I'd have to reject 90% of the services I inspect if I took a real narrow view of 110.3(B) in this case.
There are many listed adapters on the market but it can be tough to get the supply houses to stock them because most electricians would reach for a GRC coupling & whatever other fittings he needed to make the change.
Few things are harder to put up with than the annoyance of a good example.