Well to be honest I think there is not much left to discuss. Nothing that has happened is out of the ordinary. Both countries did as they said. But there are 3 recent developments that should be considered together to make a sense of what is going to happen from now on:
1- The US has dramatically lowered her tone After the delivery of the S-400 compared to before it. DoD officials are being very careful inchoosing their words, they are avoiding saying that Turkey is out for good, instead saying Turkish participation in the program is “suspended”. Implying there is room for negotiation. Read up on this here:
https://www.defensenews.com/air/2019/07/17/turkey-officially-kicked-out-of-f-35-program/
2- Hakan Atilla was released from prison yesterday. His detention was a major source of contention between Turkey and the US. And the timing of his release is interesting.
http://www.hurriyetdailynews.com/turkish-banker-moved-to-us-immigration-detention-center-145103
3- Turkey is amassing troops in the Syrian border and the US is sending James Jeffrey with a high level delegation to Turkey soon to discuss the S-400 and Syria.
While it is too early to say anything definite about the trends going on, I would say that the war of bluffs between the two countries is over now and they are coming back to reality. I see the 3 points above as reconciliatory signs on the US part. They saw that Turkey was not merely bluffing about the S-400 and they have nothing to gain by punishing Turkey now. Expelling Turkey comletely is a lose-lose for both sides. The US loses billions in defence exports and Turkey will have to purchase inferior warplanes. They have to suspend Turkey from the F-35 program to save face (they can’t back down after threatening Turkey for so long) but aside from that I think they will try to find ways of pulling Turkey back from the Russian side. There is a good chance that Turkey will rejoin the F-35 program within a couple of years after making some symbolic concessions, but I wouldnt bet my money on it.