If you are asking if Swift is ready for prime time I'd say that it is. Of course there are many more considerations than that when decided on what language to use for a project. Consider your experience, timeline expectations and if you are familiar with the problem space or type of application or not. Introducing too many unfamiliar technologies or trying to solve hard problems with new tools you don't know well is a good way to get poor outcomes or at the very least eat up more time than expected.
If you are asking if Swift is ready for prime time I'd say that it is. Of course there are many more considerations than that when decided on what language to use for a project. Consider your experience, timeline expectations and if you are familiar with the problem space or type of application or not. Introducing too many unfamiliar technologies or trying to solve hard problems with new tools you don't know well is a good way to get poor outcomes or at the very least eat up more time than expected.