Chabad.org — English translation + Rashi
Torah Temimah points to Sotah 15a.
E-Daf.com — Sotah 15a
HebrewBooks / Shas PDF
English: From when may the remainders be eaten? From when the kometz has been offered, as it is written “and the kohen shall cause to go up in smoke” and then “and the remainder… to Aharon and his sons.”
Diyuk of order after hakatarah — the remainders become permitted only once the kometz has gone up in smoke.
Shirayim become permitted only after the kometz is burned. The Torah first requires the kohen to cause the memorial portion to go up in smoke and only afterward speaks of the remainder belonging to Aharon and his sons, teaching that the leftovers may not be eaten until the hakatarah has been completed.