3 types of fish, 3 temperature/time per package
I would recommend doing what Stephie says in the comments - start the food right when you come in. With 5 minutes to preheat and ~20 minutes of cook time, your fish will be ready around 6:35-40. It won't be ready right when you walk in the door, but that's okay.

To answer your original question of how to cook these three fish in the same oven, here's how I would handle it:

The frozen tilapia can probably handle temperature variation more easily, so let's drop the 425 temperature. Heat your oven to 375. Since we're lower than the 425 the tilapia calls for, you will want to give it a little extra time. Put the tilapia and stuffed salmon in at the same time. Put the tilapia on the bottom rack (it will be a little warmer) and the stuffed salmon in the middle of the oven.

After about 4 minutes, put in the salmon &amp; sauce, also on the middle rack (if there's space). Leave them all in for another 16 minutes. (You may want to check after about 10 minutes to make sure the tilapia isn't overheating on the bottom. It should be pretty warm at this point, but not steaming hot.)

After 16 minutes, pull them out and check them for doneness (or appropriate heat level if they're already cooked, as I'm guessing at least the two frozen ones are). If they're not quite cooked yet, then put them back in the oven, and you can bump the temperature up to 400 for a couple minutes to give them a last boost.

You said you needed this by 5:30 tonight, so I'm guessing it's a bit late for this, but hopefully it will be useful for future questioners.