Switch ON Developer Mode on your Smartwatch, including A) Activation Developer Mode in Settings (in most cases push many times on Settings-> About watch -> Software -> Software Version) B) Set ON ADB Debugging C) Set ON Wi-Fi Debugging
Connect work station with Android Studio and smartwatch wear 3.0 to the same wi-fi network
Connect smartwatch via usb charger with workstation (obligatory in most cases at least once)
Send the command in Terminal - adb connect XXX.YYY.Z.A:5555, where XXX.YYY.Z.A - address of your Wi-fi - find it in settings of wifi in smartwatch or workstation
Accept the request on the smartwatch (always allow / always trust);
Check in Studio the change from No Device to your smartwatch.
Notes:
sometimes it's obligatory to turn on \ off ADB Debugging and Wi-Fi Debugging on smartwatch and try again;
sometimes the connection between smartwatch and Studio is working without USB connection at all (but mostly one time and you need to repeat "adb connect XXX.YYY.Z.A:5555";
sometimes you need smartphone in the same Wi Fi network with workstation and smartwatch, sometimes it works well without smartphone.