Parashas Kedoshim · Passuk 19:06
Chabad.org — English translation + Rashi
Torah Temimah · Megillah 20b.
English: “On the day of your slaughter” — teaches that the entire day is valid for shechitah.
Daytime mitzvah valid all day
Because shechitah of this korban is a daytime mitzvah, any time during the day is kosher for the act.