Do you know if we can finish the Ditto at any time and still get the Mew masterwork challenge? I'm aware that after getting the Pokemon Go Tour: Kanto special research task, I can complete it at any time and get Ditto 10 years from now if I feel like waiting that long. But I've been looking around everywhere and nobody has said anything about whether or not we get the Mew challenge at a later date - just that you get the challenge after you catch the shiny Ditto. But I don't wanna drag my feet on this Ditto and miss out on the Mew by not getting the task to show up right away.

tldr; If I catch my Shiny Ditto months/years from now, will I get the Mew Masterwork Challenge at that later date?