She will wake up at six. Her husband will not leave for work yet, and the children will be sleeping.

[Uncanny]

Is it grammatical and idiomatic in Br E to use 'yet' with Future Simple, as in:

She will wake up at six. Her husband will not leave for work yet, and the children will be sleeping.

(I wrote this). I understand that you would prefer Future Perfect.

 

[SoothingDave]

No. Will not have left yet.

 

[Tarheel]

No. Will not have left yet.

That's exactly what I was thinking, but the OP isn't interested in what we Americans have to say.

 

[5jj]

It's the same in BrE.

 

[Rover_KE]

@Uncanny, see also this similar thread.