The situation
Fictional sketch: a coauthor submits a beautiful template with no body text.
English meaning: The margins seem to have been finished before the manuscript.
Read the Japanese original
原稿より、余白が先に完成しましたな。The questionWhat does the joke point out?
Read the explanation
Clues in the scene
a coauthor submits a beautiful template with no body text.
The contrast between a polished template and missing body text identifies the target of the joke.
Each choice explained
The actual text still needs writing — Best fit
The submitted template lacks its body text. Saying the margins finished first points to the writing that remains undone.
Every margin should be removed — Does not fit
Removing every margin is not requested. It would not supply the missing manuscript content.
The manuscript is approved as complete — Does not fit
The body is explicitly absent. Treating this as approval of a finished manuscript ignores the described state.
The writer has been assigned printing duties — Does not fit
No printing assignment is made. Submitting a template does not establish a new production role.
Same words, another scene
An editor assigned someone only to check the margins of a new template, not to write its body. They complete that task and add the same joke while handing it over.
An absent body is no longer a failure to do the assigned work. The agreed scope changes the contrast into a joke about workflow.
The margin check is complete; the writing team will add the body next.
Literal meaning
A fictional remark that the blank margins were completed before the manuscript itself.
What these words cannot tell us
The deadline, reason for the missing text and whether the attractive layout will suit the actual manuscript are unknown.
A question to ask in real life
The layout is ready; when will you be able to add the body text?