Your wording is fine, but I don’t think your question is really about come in.
It’s worth noting that that come in is a phrasal verb. Ships come in. The tide comes in. After a visitor rings your doorbell and you answer the door, you may invite them to come in.
Your question seems to be asking more about come later than come in.
That said, we do often use the preposition in after we use come later.
The duel comes later in this scene.
The part where the murderer gets caught comes later in the script.
However, if we don’t use a phrase like later in the day or later in the chapter, we can use later on:
The proof of this comes later on.
Of course, you can always just use later on its own:
The proof of this comes later.