See the notes at Matthew 25:20-21.
Ten cities - We are not to suppose that this will be "literally" fulfilled in heaven. Christ teaches here that our reward in heaven will be "in proportion" to our faithfulness in improving our talents on earth.

Lord, thy pound hath gained ten - The principal difference between this parable and that of the talents above referred to is, that the mina given to each seems to point out the gift of the Gospel, which is the same to all who hear it; but the talents distributed in different proportions, according to each man's ability, seem to intimate that God has given different capacities and advantages to men, by which this one gift of the Gospel may be differently improved.

Then came the first, saying, Lord, (d) thy pound hath gained ten pounds.
(d) This was a piece of money which the Greeks used, and was worth about one hundred pence, which is about ten crowns.

Then came the first,.... Who were set in the first place in the church, the apostles of Christ, and who had the greatest gifts, and laboured more abundantly, and were eminently useful; such an one was the Apostle Paul:
saying, Lord; acknowledging the sovereignty and dominion of Christ over them, owning they were accountable to him, and that he had a right to inquire, what use they had made of their gifts, and what advantages these had produced;
thy pound hath gained ten pounds; it had been increased tenfold; or it has turned to a tenfold account, in the conversion of sinners, in the edification of the saints, and in the advancement of the kingdom, and interest of Christ. This servant owns, that the gifts he had were Christ's; he calls them, "thy pound"; and therefore did not glory in them as his own attainments, or, as if he had received them not; and ascribes the great increase, not to himself, but to the pound itself; to the gifts of Christ, as they were his, and as used by his grace and strength, and as blessed, and owned by him, to these purposes.

Thy pound hath made ten pounds. It is the Lord's goods, faithfully used, that has given the increase. The faithful discharge of duty is rewarded by an increased trust and increased honor. See notes on Matthew 25:19-23.