However, given the fact that dust is exactly what half the MCU now is following “the snap” and the fact that Evangeline Lilly is clearly making a reference to Hop Van Dyne in the associated image, it’s possible she was giving away the game, just in a way nobody was likely to notice.
Evangeline Lilly celebrated the end of filming Ant-Man and the Wasp back in November which means that she had filmed the post-credits scene by the time she made this post in December.
Of course, without any context, it just looks like a post about a successful day at work.
“Done and dusted” isn’t that unusual a phrase to use.