Saul's conversion from a disbeliever to a believer happened after Christ's ascension. We know this from the bible account of Saul and Stephen in Acts.
Christ ascended 40 days after His resurrection.
To whom also he shewed himself alive after his passion by many infallible proofs, being seen of them forty days, and speaking of the things pertaining to the kingdom of God:
About 3 1/2 years later, Stephen opposed the unbelieving Hellenistic crowd. Saul was there helping as Stephen was killed.
And cast him [Stephen] out of the city, and stoned him: and the witnesses laid down their clothes at a young man's feet, whose name was Saul.
That Saul would convert later when Christ appeared to Him. Now, before getting into that, it is important to understand that Christ also appeared to Stephen during the same stoning.
But he [Stephen], being full of the Holy Ghost, looked up stedfastly into heaven, and saw the glory of God, and Jesus standing on the right hand of God, And said, Behold, I see the heavens opened, and the Son of man standing on the right hand of God.
Is it not beautiful love displayed as irony that Saul sees nothing, but later will see?
Acts 9:1-9 tells part of the story, but it is Paul (Saul renamed) who declares he saw Christ also. It is part of his authority as an apostle.
Christ blinds Saul, but Ananias to whom Saul is sent understands that Saul saw Christ.
And Ananias went his way, and entered into the house; and putting his hands on him said, Brother Saul, the Lord, even Jesus, that appeared unto thee in the way as thou camest, hath sent me, that thou mightest receive thy sight, and be filled with the Holy Ghost.
And he said, The God of our fathers hath chosen thee, that thou shouldest know his will, and see that Just One, and shouldest hear the voice of his mouth.
Barnabas who is Paul's companion believes him.
But Barnabas took him, and brought him to the apostles, and declared unto them how he had seen the Lord in the way, and that he had spoken to him, and how he had preached boldly at Damascus in the name of Jesus.
And again, Paul himself declares he saw the risen Lord.
But rise, and stand upon thy feet: for I have appeared unto thee for this purpose, to make thee a minister and a witness both of these things which thou hast seen, and of those things in the which I will appear unto thee;
Am I not an apostle? am I not free? have I not seen Jesus Christ our Lord? are not ye my work in the Lord?
1 Cor 9:1
And last of all he was seen of me also, as of one born out of due time.
Now, with that in mind that at least two people had seen the Lord after His ascension, what does it mean for people today? Specific to the OP, has the Second Coming already come and gone circa 34 AD?
No, what happened to Stephen and Saul and what happens at the Second Coming are two separate events.
Which also said, Ye men of Galilee, why stand ye gazing up into heaven? this same Jesus, which is taken up from you into heaven, shall so come in like manner as ye have seen him go into heaven.
He ascended in a cloud and will return in like manner.
Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.
1 Thes 4:17
Paul didn't confuse Christ appearing to him with Christ's Second Coming. Neither should we.