Probably not until later in the year, at the very earliest. For some of the plants, you may not know until next spring.
One other problem that might occur is, if some of the plants do
survive and put out new growth late this year, the new growth will be killed during the winter, because it won't have time to harden off. Depending on how much damage has been done to the roots, they may or may not make it through the winter.
Brush killer works by being absorbed through the leaves and bark of a plant. Then it works its way down into the roots, and kills them, as well. Since the upper parts of the plants have wilted, it indicates that the brush killer has been absorbed and caused some root damage.
I am not familiar with that brand of brush killer, so I don't know how well it works. I have had blackberries, which are particularly
difficult to kill, survive treatment with some brush killers.
I'm pretty certain that you may as well replace your annuals. Be sure to read the label on the brush killer container, to see what it says about how soon you can replant. Some chemical treatments leave residue in the soil for a longer time than others.
Wisteria, I think is pretty tough, and very well may survive the spraying.
Azaleas can be damaged fairly easily by chemicals. I can't predict how likely it is that they'll survive.
What kind of perennials were sprayed? Some are pretty tough, while others are more delicate.
Again, I'm so sorry that you have to deal with such a sad occurence.