No one said "fruit bears instantly". That is a strawman. I never said that. I merely said it does not take a period of growth and maturity to bear fruit. Because one can bear fruit in many ways that do not require any level of maturity.
A person that just got saved two minutes ago can tell his friend about what Jesus did for Him, and if the Holy Spirit chooses, he can use that to draw a sinner to Christ.
A person who gets saved today can put an offering into the missionary offerering tommorow, and God can use that gift to save souls, and that is fruit on his or her account.
A person that gets saved five minutes from now can praise and glorify God, which is the fruit of their mouth.
The Samaritan woman didn't need a period of growth and maturity to bring a whole village to Jesus.
Andrew did not need a period of growth and maturity to bring Peter to Jesus.
Phillip did not need a period of growth and maturity to bring Nathaniel to Jesus
etcetera
The examples you have above, do you consider them as bearing fruit?
I have always considered bearing fruit to be the fruit of the Holy Spirit.
Galatians 5:22-23
22 But the fruit of the Spirit is love, joy, peace, longsuffering, kindness, goodness, faithfulness, 23 gentleness, self-control. Against such there is no law.
The above follows
Galatians 5:16-21
Walking in the Spirit
16 I say then: Walk in the Spirit, and you shall not fulfill the lust of the flesh. 17 For the flesh lusts against the Spirit, and the Spirit against the flesh; and these are contrary to one another, so that you do not do the things that you wish. 18 But if you are led by the Spirit, you are not under the law.
19 Now the works of the flesh are evident, which are: adultery, fornication, uncleanness, lewdness, 20 idolatry, sorcery, hatred, contentions, jealousies, outbursts of wrath, selfish ambitions, dissensions, heresies, 21 envy, murders, drunkenness, revelries, and the like; of which I tell you beforehand, just as I also told you in time past, that those who practice such things will not inherit the kingdom of God.
So to me Paul is bringing a contrast of the works of the flesh, which as belivers walking in the Spirit will manifest fruit, and as it increases the works of the flesh decrease.
So that has always been focus concerning by bearing fruit.
I'm not negating telling people about Jesus in any way shape or form.
But for me if we walk the walk with Holy Spirit then people will see this.
There is nothing worse than telling people about Jesus and yet walk according to the flesh with no regards to actually bearing fruit.
Now to me that is greasy grace.