Yes FL Studio has been released for macOS.
If you already own FL Studio, that license can be used on both Windows and macOS machines. You may make multiple installations on any computers you own. So long as you are the only user.
If you don't currently own an FL Studio license you can buy an FL Studio license for Windows which will grant you access to the Mac version of FL Studio. A single FL Studio license is applicable on both Windows and Mac.
Image Line Support Team