Like many, you completely abuse the meaning of that verse to suit your cessationism, and if you insist that prophecy has ceased, then knowledge itself must also have ceased, for that is what Paul clearly states.
You should also know there is absolutely nothing in that whole chapter indicating that "the perfect" has anything whatsoever to do with completing the canon of scripture.
1Cor13v8Love never fails; but if there are prophesies, they will be done away; if there are tongues, they will be ceased; if there is knowledge it will pass away.
9For we know in part and we prophesy in part; 10but when the perfect should come, the partial will be done away.
Strong's Concordance
teleios: having reached its end, i.e. complete, by ext. perfect
Original Word: τέλειος, α, ον
Part of Speech: Adjective
Transliteration: teleios
Phonetic Spelling: (tel'-i-os)
Definition: having reached its end, complete, perfect
Usage: perfect, (a) complete in all its parts, (b) full grown, of full age, (c) specially of the completeness of Christian character.
HELPS Word-studies
Cognate: 5046 téleios (an adjective, derived from 5056 /télos, "consummated goal") – mature (consummated) from going through the necessary stages to reach the end-goal, i.e. developed into a consummating completion by fulfilling the necessary process (spiritual journey). See 5056 (telos).
[This root (tel-) means "reaching the end (aim)." It is well-illustrated with the old pirate's telescope, unfolding (extending out) one stage at a time to function at full-strength (capacity effectiveness).]
Paul is simply referring to the consummation of the age, the return of Christ on earth as opposed to hidden in heaven.
All prophetic events culminate with Christ's reign on earth.