They entered the Kingdom of God but yet they wouldn't inherit it until Christ's Second Coming. The Apostle Paul had this perspective also. This was how the Early Church understood the times they were living in. Paul viewed salvation in this context. Salvation began at the cross, but won't be completed until Christ returns.
Salvation is past, present and future.
There is a past tense aspect to our salvation, a present tense aspect and a future tense aspect. I have been saved, I am being saved and I will be saved. I have been saved . By faith in Christ I have been justified, acquitted, declared righteous, my sins have been forgiven. I have been saved.