Re: Patch is already out...
I haven't seen it yet for either MacOS and iOS.
I looked at the security reference for iOS 12.1.3 and MacOS 10.14.3 a few days ago, and that only fixed a possible remote execution risk for FaceTime, not a your-neighbour-can-do-this intercept problem.
That said, I do think that a lot of staff will be busy fixing this one so I expect a beta soon - I can see my iPad already pulling in a beta update (I have one non-essential iOS device on betas so I can see the updates coming before they go public).