well I don't think Wireless display option is never present on Stock Android Phones, this is feature found on custom ROMs. Although I can confirm Screen cast works fine as long as you have any device that has Chromecast built in like Mi TV Box in my case.
But for other smart TVs we need wireless display to connect them with phone. So I think Nokia must provide this with an update OTA as soon as possible. If there is no wireless display option, then Cast option is regardless of using.