Dua because she at least has a date, even if it's moved to May. Zara probably won't release until she gets a US hit because that's just how Epic operates.
They all have tracklists together so far, so its clear that they all have their albums done. Tbh, I feel like Bebe is gonna drop All Your Fault within this month. I think Zara's gonna release last, seeing as she doesn't even have an album title yet.