This whole chapter is speaking of AFTER God has destroyed the nations and gathered all of His people back to Him and is reigning over the Gentiles,as per Psalm 47.
You could take it as an event during His return, I see it as after he has already destroyed His enemies.
It would be quite ludicrous to think that He is only returning for His Apostles.
The LXX has a bad rendering of this verse through and through and is faulty.
It says in Hebrew:
"The princes of the people were gathered people of the God of Abraham, because to God the shields of the land are very exalted."
Here it speaks of the princes, as well as the people, not exclusively of the princes. I have never heard anyone allude to Paul expecting Christ to only come for the apostles. Isaiah 11:11 tells us that He is coming for the remnant. Zechariah 14 tells us that He is fighting against the armies that come against Jerusalem.
Isaiah 27:12 And it shall come to pass in that day, that the LORD shall beat off from the channel of the river unto the stream of Egypt, and ye shall be gathered one by one, O ye children of Israel.
*I Thessalonians 4:14 For if we believe that Jesus died and rose again, even so them also which sleep in Jesus will God bring with him.
That tells us of him bringing the dead in Christ.
I Thessalonians 4:17 Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord.
That verse is for the rest of us that are alive. Those 2 verses encompass all of the believers that He is coming for.
So in conclusion, no, He is not coming for just the Apostles.