Just recently stumbled across this site, and what a blessing it’s been to read how many wonderful things are being shared here. I hope it’s not bad form to enter a discussion so late.
FWIW, the OP led me to consider the prodigal son. As I see it, he was “saved” from his misery the moment the Holy Spirit brought to memory his father’s loving kindness, even to slaves, and started him on his journey home. But there seems little doubt that reconciliation, in its fullest sense, was delayed until the young man actually made it home. And how wonderfully shocking to discover that his father had seen him coming from a long way off, and the party was already started when he got there!
So as amazing as salvation certainly is, I think reconciliation is an even bigger deal. As I imagine it, the prodigal son, quite understandably, would have wanted, and I think even expected, that his father might save him from his miserable circumstance, and he certainly got that. Yet, I doubt he could have even dreamed that his entire relationship with his father would be restored to boot.
IOW, I think the parable teaches that God wants so much more than to save us. He is our Father, who loves us with an amazing love. In our misery, His Holy Spirit whispers to us the truth of His loving kindness and mercy, which is extended even to the most lowly and unworthy among us. And each time He can see one of us starting our journey home to Him, He is rejoicing and preparing a reception the like of which our finite minds could scarcely comprehend.
Peace and blessings to you all,
Andy