That's speaking about the future, the first fruit are the saints, the first resurrection. Paul says in 1 Corinthian 15: 20 But now is Christ risen from the dead, and become the firstfruits of them that slept. 21 For since by man came death, by man came also the resurrection of the dead. 22 For as in Adam all die, even so in Christ shall all be made alive. 23 But every man in his own order: Christ the firstfruits; afterward they that are Christ's at his coming. 24 Then cometh the end, when he shall have delivered up the kingdom to God, even the Father; when he shall have put down all rule and all authority and power. 42 So also is the resurrection of the dead. It is sown in corruption; it is raised in incorruption: 43 it is sown in dishonour; it is raised in glory: it is sown in weakness; it is raised in power: 44 it is sown a natural body; it is raised a spiritual body. There is a natural body, and there is a spiritual body.
Let's tie this in with Revelation 20: 4 And I saw thrones, and they sat upon them, and judgment was given unto them: and I saw the souls of them that were beheaded for the witness of Jesus, and for the word of God, and which had not worshipped the beast, neither his image, neither had received his mark upon their foreheads, or in their hands; and they lived and reigned with Christ a thousand years. 5 But the rest of the dead lived not again until the thousand years were finished. This is the first resurrection.