The A350 is still in development right now. In fact it has been confirmed to be in beta testing. I recommend you looking into the topic I have linked below. It will contain important milestones within the development process that you can look into. We don’t provide release dates given how fluid this process is. Bugs and other issues arise as work progresses so dates are never given.
On another note, check out the following topic regarding our next update, 19.4, which is planned on being pushed sometime between early and mid December. Feel free to read through that material as well.