And since Star Wars has a meta plot
Just to be picky - Star Wars has a plot. It is a story (or collection of stories). Stories have plots.
"Metaplot" is an RPG-specific term, to differentiate between the events in the PC's lives from the large scale events in the setting beyond the PCs (or, to differentiate the events at your table from the events the publisher says takes place).
If you play a Star Wars game, then the events of the Star Wars fiction may become the metaplot for your game. But, if you are watching the movies, those events are the plot of the movie, not the metaplot of the movie.