How to determine from command line if NVMe slot is gen 3 or gen 4?

cmd slot   Dan cmd789 slot

It is off topic here , though you can get the info using following cmd wmic logicaldisk or , diskpart then list volume

CMD 88 0 192 192 6960 0 0 AAA SEND STOP EV 89 0 168 0 7128 0 0 CEF Chassis slot number or module interface slot number  portCmd · portDecom · portDisable · portDPortTest · portEnable slot or a slot range Use switchShow for a listing of valid ports

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