NW metal has had most IFE ripped out in the past or simply delivered without even the prep for IFE. It was strictly BYO entertainment for several years on domestic.
And now we want Wi-Fi on NW metal....... don't hold your breath. Doubt it will be turned on until there is a single operating cert for DL as a merged entity.
As a hub captive, it is rare to get on DL metal, but looking forward to trying out the Wi-Fi !!