Which parts of the Joel prophecy quoted at Pentecost were fulfilled then, and which parts are still future?

The Spirit's outpouring (Joel's words through verse 29) was fulfilled at the first Advent and Pentecost. The heavenly and earthly wonders—blood, fire, pillars of smoke, darkened sun, blood moon—and the great and terrible day of the Lord (verses 30–32) did not occur then and remain future.

Les explains that the Joel passage Peter quotes is one of those portions where the first part was fulfilled at Christ's first Advent and then there is a break because the rest has not yet happened. Everything up through verse 29, including the outpouring of the Spirit upon servants and handmaids, took place at His first Advent and including the day of Pentecost. But verse 30 did not happen at Pentecost; it has not happened yet, though it is going to. The signs in the heavens and earth—blood, fire, pillars of smoke, the sun turned to darkness, the moon to blood—along with the great and terrible day of the Lord and the deliverance in Mount Zion and Jerusalem, are still future. Les teaches that verses 30, 31, and 32 have not happened yet.

Joel 2:29

And also upon the servants and upon the handmaids in those days will I pour out my spirit.

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Which parts of the Joel prophecy quoted by Peter at Pentecost have already been fulfilled and which are still future?

The portion of Joel's prophecy up through verse 29 was fulfilled at Christ's first advent and at Pentecost, including the pouring out of the Spirit on servants and handmaids. Verses 30–32 remain future: heavenly and earthly wonders, blood, fire, pillars of smoke, the sun darkened, the moon turned to blood before the great and terrible day of the Lord.

What parts of the Joel passage were fulfilled at Jesus' first Advent and Pentecost?

The Joel passage up through verse 29 was fulfilled at Jesus’ first Advent and Pentecost, including the Spirit poured out on servants and handmaids. Verses 30–32—the wonders in heaven and earth, blood, fire, smoke, darkened sun, blood moon, and deliverance in Zion—were not fulfilled at Pentecost and remain future.