Well... The Lord hasn't come yet. lol, unfortunately. so I'm sure since He hasn't come, there's still much more work to be done for His kingdom. As for salvation of those before the Lord's ministry... Those who knew of YHWH, God our Creator, and put their faith in Him. Mainly the Jews around those times, i.e. Abraham, Moses, Daniel, Isaiah etc. Their souls were in what they called paradise, not heaven mind you, basically waiting for their Messiah to come and bring them up. They couldn't go up and be with the Lord yet b/c Jesus had to come and conquer death, clean our sins with His sacrifice. Remember, Jesus tells the story of a rich man and poor man on earth. When they died, they weren't in heaven, the poor man was in "Abrahams bossom", which is the paradise- being comforted while waiting, and the rich man was in Sheol, which is a waiting place for those to be judged. This in my opinion is a point past "the milk" so to speak. So to keep it simple here. They were waiting for their Messiah even after death. Once He came, our Lord Jesus, they were finally able to be with the Lord after He conquered death and wiped our sins away for those who believe. Like I said this, in my opinion, is a tougher teaching. Hence, Paul and Peter refer to us craving milk first then moving on to solid foods, so to speak. If there's something you don't understand I will try better next time, just let me know my friend.