Sadly, no. They are still making breaking changes, and overall it's not stable or production ready. Probably be at least 6 months to a year (judging from history).
That said, I made some demos and released them, and they didn't crash anyone's computer (except for mine, while making it). If you want to experiment, I mean it works well enough to do basic stuff. Most of the features are in there, it's just that they may not be working 100%. I'm still trying to decide if it's worth it, cause Godot 3.x is really stable. 4.0 has much better graphics, and some seriously good new features, but you add a lot of risk if it's a serious commercial project.
I would say if you are making like hobby demos for free, it's good enough for that. But I might wait if it's a serious project. Or if you just don't like headache, cause the editor will crash, things will get broken.
