Both are rolling it out.
Qantas is now at 67/68 of its 75 737s,
and I think 6 of the 8 domestic 332s.
Virgin's big differentiation is that only they will have access to/from NZ, as the NBN sat that Qantas uses doesn't cover the water
and Virgin has Wifi on its international fleet, whereas Qantas is waiting for the new ViaSat3 satellites that won't be active until 2022/23