The second coming of Jesus Christ is with the armies of heaven. That includes the redeemed of the Lord, as well as holy angels. Those who are redeemed wear clean white robes. That symbolizes the righteousness of the saints. Jesus has taken away all our sins and given us His righteousness (2 Cor. 5:21). The redeemed of the Lord witness His coming in victory over all God's enemies.
"He Himself treads the winepress of the fierceness and wrath of Almighty God" (Rev. 19:14-16). Jesus our Lord revealed the love of God at His first coming. He reveals the wrath of God at His second coming. Those who believe on the Lord Jesus Christ receive the love of God. Those who reject God's Son in unbelief and rebellion receive the wrath of Almighty God.
The winepress is a symbol of the wrath of Almighty God. God will totally crush all those who live in rebellion against Him. Their defeat is swift and complete. In Bible days a winepress would be found at a vineyard. Grapes were harvested and thrown into the trough. They were crushed as the grape juice flowed into another trough. That symbol pictures the coming of Jesus to defeat of God's enemies.
The second coming of Christ is with divine omnipotence on earth. He will strike the nations with the sword of His word. He is coming to rule with a rod of iron. Those symbols reveal that Jesus our Lord has all power in heaven and on earth. Jesus is coming with these words on His robe, "King of Kings and Lord of Lords."