[editor-surveyor]

The “devil” is in heaven, and has been for 6000 years.

He will be cast out at the midpoint of Daniel’s 70th week, bringing on his tribulation of the saints.

He has access to Earth as he pleases, but his chief occupation is accusing the saints before the throne of the Father.

The war here on Earth comes after the first resurrection, and after the bowl judgements that follow the first resurrection.
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[StormPrepper]

Job 1:
7 And the Lord said unto Satan, Whence comest thou? Then Satan answered the Lord, and said, From going to and fro in the earth, and from walking up and down in it.

Rev 12:
7 And there was war in heaven: Michael and his angels fought against the dragon; and the dragon fought and his angels,

8 And prevailed not; neither was their place found any more in heaven.

9 And the great dragon was cast out, that old serpent, called the Devil, and Satan, which deceiveth the whole world: he was cast out into the earth, and his angels were cast out with him.

Hence Satan's statement to the Lord of going to and fro in the earth, because as John saw in Revelation, he had been cast out into the earth.

This is mentioned in Jude 1:6 as well:
6 And the angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under darkness unto the judgment of the great day.

The devil is on the earth and has been from the beginning of man. No unclean thing can dwell with God, when Lucifer rebelled, he was cast out for this cause.