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Paul is using the day/night metaphor here, but he switches them, and the night is far spent. The night is this period of time that we are living in—in the darkness of Satan's rule over the earth, under the governance of men, deceived by all the false religions, and so forth. But the teaching is exactly the same as John 9:4: that there is only so much time to get prepared for the Kingdom of God. We only have so much time to get prepared for the Sabbath. There is a powerful lesson here in regard to the preparation day.
It is reasonably clear that God has allotted six thousand-year days for man, and one thousand-year day for Himself. That time will be a rest for His Creation. We are near the end of the sixth thousand-year period, and the "day" is coming when no work can be done. For us, it will be, "That's all she wrote."
John W. Ritenbaugh
The Fourth Commandment (Part 5)