I'm still on Win10 1809. (I quit clicking on the "Check for updates" button several months ago.) Here's what my Update screen has looked like for a few weeks:
I became curious, wondering why 1903 hasn't been dumped on me yet, and did a little checking. It seems Microsoft isn't being so quick to automatically force the semi-annual updates down anymore. As I understand it, 1903 won't be automatically installed until towards the end of support for 1809 (mid-November). I don't know exactly how long they'll wait, and I'll probably install 1903 before then.
I think it's nice to be able to wait a little while on these, leave them in the oven a little longer and wait for the rest of the world to catch up too. I hope MS keeps doing this, sure would make life a lot simpler for a lot of people.