I tend to think they'd wait to close Mummy (if that is the plan) until SNW is open or at least imminent, like a firm opening date.
I also kinda think that, just based on how many times that ride has seemingly been on the chopping block only to keep going, that we'd see a re-done Parisian Courtyard before a Mummy teardown, but that's only because it's survived for as long as it has. IDK what it is with that ride specifically but it feels immortal at this point.