We are working on many certifications including the ones you have mentioned. We need to go through many test cases and fix anything that may not still work. This means you should start to see some official releases toward the end of Q2 2019.
In the meantime, I recommend that you test Office 2019 and Windows 10 offline because Microsoft tends to have great stability between releases. And, in your testing, if you find some bugs, we will be happy to fix them sooner.