When does `fly deploy` return?

When does fly deploy return/exit?
It seems like it is after all of the new machines are up.
Does it wait for the old machines to all be down?
Is there a way to wait for all of the old machines to be down?

I’m doing bluegreen deployment if it matters. And the reason I am interested is because I want to wait for all of the old machines to be down before running my post deploy migrations.

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