Already & Not Yet TensionCraig Blaising writes:

“The theology of Luke-Acts teaches that when Jesus ascended into heaven, he was enthroned with kingdom authority.64 Paul teaches that Jesus is presently seated at the right hand of God with all things in subjection under his feet (Eph. 1:19-23; Col. 1:13-18; cf. 1 Peter 3:22). New covenant blessings have been inaugurated through the cross and the outpouring of the Holy Spirit (1 Cor. 11:25; 2 Cor. 3:2-6). These blessings institute features of the promised eschatological kingdom. Jews and Gentiles who have been reconciled in Christ have received the Holy Spirit as a down payment on their future redemption and form a body of peoples united in peace by the Holy Spirit, demonstrating the new humanity of the eschatological kingdom (Eph. 1:13-14; 2:12-22). They have been transferred into the kingdom of God’s Son (Col. 1:13) and have been made a kingdom and priests to serve the God and Father of Jesus Christ (Rev. 1:6). But these are only inaugural aspects. The fullness of the eschatological kingdom is yet to come.” (Three Views on the Millennium and Beyond)

Blaising, a progressive dispensationalist, sounds a lot like Ladd here. Times sure have changed since the days of Walvoord!