Single round trip
It's not that bad, but it's not excellent either. It means 1.2 M$ of weekly income before you pay for the lease/depreciation, salaries, and other things like that. IIRC, when I played very long range(Glasgow-Australia, mainly), most of my 777-8X were doing around 1.5/2M$ per week after depreciation. And it was not much for the cost(around 500M$ each). For such a plane, you shall also count a few 100s of k$ in personal costs. So you're probably actually in the green, but not as much as you seem to think.
I had a flight to Auckland(9668NM) that was not really making money, And I'm pretty sure I was losing money on the road to Christchurch(10048NM). IIRC, I had to rely on 777-200LR there, even the 777-8X was too short-legged here. And the -200LR is not as good in the 2020s.