What does it mean that the Father made us meet to be partakers of the inheritance of the saints in light?
It means the Father has prepared believers to share in the inheritance of the saints in light. He has delivered them from the power of darkness and translated them into the kingdom of His dear Son, which is in heaven, making them citizens with a heavenly base of operations.
Les explains from Colossians 1:12-13 that Paul gives thanks to the Father, who has made us meet—that is, prepared us—to be partakers of the inheritance of the saints in light. This is not an earthly inheritance centered in the earthly Jerusalem, where the temple still offers sacrifices. Instead, the Father has delivered us from the power of darkness and translated us into the kingdom of His dear Son. Les points out that the kingdom of the Son is in heaven, so believers now have a heavenly base of operations. The head of the body is in heaven, and we are citizens. This fits the earlier contrast: Jerusalem which is above is spiritual, heavenly, and free, not the earthly city.
Giving thanks unto the Father, which hath made us meet to be partakers of the inheritance of the saints in light: