Is the church's greater prosperity today a sign that it is receiving God's promises?
No. Greater material prosperity today is not necessarily a sign that the church is receiving God's promises. Believers are not promised everything of this world's good, and having things better than ever does not mean we are cashing in on the promises. It may even harm the church, which grew under pressure.
Les explains that while believers today may have it better materially than believers ever had, that is not necessarily because they are cashing in on God's promises. Scripture does not promise everything of this world's good; we may have it, but we shouldn't expect it. In fact, Les suggests it is the worst thing that happened to the church that we have it so good, because the church grew when it was under pressure. He warns that pressure may return, as in the early centuries of Christianity, and even says we might need to be shaken up. He encourages prayer that it doesn't happen.