Once again, how did you get from "will cease" to "have ceased"? (1 Cor 13:8)
Matthew Henry is usually my GO-TO commentary, and he concludes that "perfection" is achieved in Heaven--not on Earth.
Here's an exerpt from his commentary on the verse(s):
"I. From its longer continuance and duration: Charity never faileth. It is a permanent and perpetual grace, lasting as eternity; whereas the extraordinary gifts on which the Corinthians valued themselves were of short continuance. They were only to edify the church on earth, and that but for a time, not during its whole continuance in this world; but in heaven would be all superseded, which yet is the very seat and element of love. Prophecy must fail, that is, either the prediction of things to come (which is its most common sense) or the interpretation of scripture by immediate inspiration. Tongues will cease, that is, the miraculous power of speaking languages without learning them. There will be but one language in heaven. There is no confusion of tongues in the region of perfect tranquility. And knowledge will vanish away. Not that, in the perfect state above, holy and happy souls shall be unknowing, ignorant: it is a very poor happiness that can consist with utter ignorance. The apostle is plainly speaking of miraculous gifts, and therefore of knowledge to be had out of the common way (see ch. 14:6), a knowledge of mysteries supernaturally communicated. Such knowledge was to vanish away. Some indeed understand it of common knowledge acquired by instruction, taught and learnt. This way of knowing is to vanish away, though the knowledge itself, once acquired, will not be lost.
But it is plain that the apostle is here setting the grace of charity in opposition to supernatural gifts. And it is more valuable, because more durable; it shall last, when they shall be no more; it shall enter into heaven, where they will have no place, because they will be of no use, though, in a sense, even our common knowledge may be said to cease in heaven, by reason of the improvement that will then be made in it. The light of a candle is perfectly obscured by the sun shining in its strength." (Source:
https://www.blueletterbible.org/Comm/mhc/1Cr/1Cr_013.cfm?a=1075008)