I'm sorry, but 3 maybe 4 summers ago non of the Norwegian 787 fleet had WiFi.
Infact my last time on a Norwegian aircraft was end of 2017 and only then where aircraft starting to have WiFi installed.
With Norwegian the USP with WiFi was the fact it's free, I think for the long haul side of the business WiFi would have to be paid for, therefore initially it was not introduced on the widebody fleet.