How Strong Would Zombie Superman Be if He consumed the Sun?

The green lantern corp retreated and stated the solar system was a lost cause.

How strong would he potentially be after eating the sun?

Well we saw how strong Prime Superman was when he flew through several or more suns and knocked the world forger on his ass. I doubt DCeased supes will be that powerful even if he does absorb the whole sun. Now since the entirety of the GL core was like 'nope' then I imagine powerful enough to be an intergalactic threat 🤷‍♂️