Rev_20:2 And he laid hold on the dragon, that old serpent, which is the Devil, and Satan, and bound him a thousand years,
Is Satan already bound?
Yes, he is bound. Jesus bound him at Jesus first advent.
He said as much in Matthew 12:
25And Jesus knew their thoughts, and said unto them, Every kingdom divided against itself is brought to desolation; and every city or house divided against itself shall not stand: 26And if Satan cast out Satan, he is divided against himself; how shall then his kingdom stand? 27And if I by Beelzebub cast out devils, by whom do your children cast them out? therefore they shall be your judges. 28But if I cast out devils by the Spirit of God, then the kingdom of God is come unto you. 29Or else how can one enter into a strong man's house, and spoil his goods, except
he first bind the strong man? and then he will spoil his house.
This world has been Satan's house in a sense for some time.
But at Christ's advent he bound him and began a process of spoiling Satan's house.
Christ was slain and thereby earned the right to the title deed of the earth.
Revelation 5:9- "And they sung a new song, saying, Thou art worthy to take the book, and to open the seals thereof: for thou wast slain, and hast redeemed us to God by thy blood out of every kindred, and tongue, and people, and nation;"
This is why Jesus began the Great Commission this way, "All power (Grk- exousia which means authority) is given me in heaven and earth, Go ye THEREFORE..."
Satan is bound while God's Kingdom, Christ's church takes back what is rightfully His.
Satan is bound so that he cannot ultimately succeed in deceiving the nations from believing the Gospel.
Now the common retort to this is that one can look around and see that Satan is not bound because of all the lying and deceiving and destruction and calamity that plagues this world.
This argument does not hold water for this reason: If it is appropriate to say that Satan was "DESTROYED" at Calvary then it is CERTAINLY appropriate to say something less intense like, Satan is bound at the first advent of Christ.
Hebrews 2:14 says that the Devil was not only bound but something even greater than that- he was DESTROYED.
"Forasmuch then as the children are partakers of flesh and blood, he also himself likewise took part of the same; that through death he might
destroy him that had the power of death, that is, the devil;"
Could a "BOUND" devil do all the damage that we see today?
CERTAINLY if a "DESTROYED" devil can!