How likely will OnCompletion of the Flow API become stable soon?

I need the function onCompletion from Kotlin Flow in a production system. But this function is marked with @kotlinx.coroutines.ExperimentalCoroutinesApi, what sparked discussions whether we should use Flow at all in my project! I could live with the risk, but I see the point to avoid experimental code in a production system.

Before I migrate from Flow to Reactor I try to find out how likely it is that this function will become stable in the next few months. Do you know something about it?

If you encapsulate experimental API in your code, it is perfectly OK to use. Experimental means you should not expose it to your library consumers.