hard wire era 100 to my mac mini

You’d need some sort of analog output from the Mac mini, and a Sonos line in adapter to the Era 100. Alternately, you could connect to the Era 100 by Bluetooth. Either way, as long as both Era 100s are on your network properly, you’d get stereo from the pair, but since Sonos doesn’t make speakers designed for connection directly to computers, you’d still have to deal with the 75ms line in delay built in to the software, making lip-sync / game play virtually impossible. There’s a whole section about using Sonos as computer speakers here. 

thanks, I like to watch band video and there is a delay with bluetooth

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You will have a delay using analogue too, as ​@Airgetlam says. When combining pictures with sound, you need a Sonos soundbar, that needs either an optical or an HDMI-ARC connection.