That furnace is no harder to connect to an existing zone system then any other furnace.
What confused him, is he didn't now what to do about the 2 stage heat.
Do you know the brand and mod number for youor zoning system.
Some are not able to control a 2 stage heat furnace, in that case you have to use the furnace timer.
And I'm guessing he is any way.
I wouldn't wait till Saturday.
Others may disagree with me.
But, I'd call him back, and ask him to be there early tomorrow morning.
If he says he can't make it.
I'd tell him that when he gets there Saturday, I'll give him a new check, because I'm stopping payment on the one he has now. And until the furnace works right, he won't be pais in full.