Preterism is the eschatological view that either all (full) or some (partial) prophecies have been fulfilled. This is in contrast to the futurism view.
OP: According to Preterism has Jesus already delivered the kingdom to God?
Keeping in mind that 1 Corinithians was written circa 55AD, full preterists would say yes, this prophecy was fulfilled in 70AD (Jerusalem temple) to 73AD (Onias temple in Egypt). This was the complete and final destruction of the Old Covenant that still called for animal sacrifice in lieu of Jesus Christ's one, done once, never to be repeated, sacrifice after a 40-year grace period still calling for repentance from Christ's death in 30AD and Hellenistic rejection in 33AD (Acts 6:9).
Back to the verse in question whether Jesus has already delivered His kingdom to God.
then -- the end, when he may deliver up the reign to God, even the Father, when he may have made useless all rule, and all authority and power -- (YLT 1 Cor 15:24)
When Christ walked the earth, He proclaimed that the kingdom of God was nigh, but how would He know, from a human point of view? How would He convince His listeners of this?
And in the days of these kings shall the God of heaven set up a kingdom, which shall never be destroyed: and the kingdom shall not be left to other people, but it shall break in pieces and consume all these kingdoms, and it shall stand for ever. Dan 2:44
This establishment of God's kingdom was begun and continues (verb tense of "set up") during the times of the last kingdom in Daniel's vision of four kingdoms, the Roman kingdom.
Christ then built upon this prophecy as being fulfilled in His time.
And [Christ] saying, The time is fulfilled, and the kingdom of God is at hand: repent ye, and believe the gospel. Mark 1:15
Repent, change your mind about the Old Covenant that IF you could do it all, you would be in right standing with God, and instead believe the gospel of the salvation by grace through faith in the work of Christ.
And as they heard these things, he added and spake a parable, because he was nigh to Jerusalem, and because they thought that the kingdom of God should immediately appear. Luke 19:11
The disciples thought Christ would immediately rule, but first the Suffering Servant prophecies had to be fulfilled that showed His passion from sufferings to resurrection.
So, Christ preached the kingdom was nigh. He had to fulfill all that was written about Him. This He did.
Christ delivered the kingdom to God the Father when all other choices, authority, and power came to an end in 70AD.
As John and Peter declared the truth of the alternative though prophesied New Covenant (Jer 31:32, Heb 8:9),
You have appointed them as a kingdom and priests to serve our God, and they will reign on the earth." (Rev 5:10).
But you are a chosen race, a royal priesthood, a holy nation, a people of his own, so that you may proclaim the virtues of the one who called you out of darkness into his marvelous light. 1 Peter 2:9