This whole chapter shows us that everything was exactly as King David had commanded (v. 14); and as Moses had commanded (v. 13) that the people were all obedient to what was told them.
V.10, 15; that they finish any work which they had started (v. 16). So, look at the end of verse 16. Then the Lord directed the work outside of the worshipping of God in verses 17-18. Their ships returned, and millions of dollars of gold were given to Solomon. All this chapter is a picture of what Israel’s people will do in the millennium, when Christ will rule over this whole world, and where obedience and happiness will be universal (Psa. 72:8).