The shop replaced the timing belt and the coils, spark plugs, and cylinder head and upon picking up the car it still has misfires on all 3 cylinders of that cylinder bank?

You need to bring it back to them.

Whether this is valve timing, compression, vacuum leak (intake manifold gaskets) , ignition issue, or fuel (unlikely all 3 injectors on the same cylinder bank would fail at once) they just removed and replaced all the parts that would cause that on only one cylinder bank. (if your piston rings are shot they should have never sold you a cylinder head).

You're complaining about the DTCs but not any driveability issues.

If you have a scanner and want to arm yourself with a little knowledge, look at the Freeze Frame Data from when those codes were thrown.

Check what the ECT, RPMs, and Fuel Trims were at the time.

Are the codes being thrown before warm-up at idle with STFT on that cylinder bank elevated positive? (a new intake manifold gasket leaking. maybe not evenly torqued down)?

You may want to pull out the spark plugs and compare them to the pictures on one of the online spark plug charts.

You could even grab a cheap compression gauge and do a compression test.

But even good mechanics are human and occasionally screw-up.

What makes them "good mechanics" is when they get a job come back on them, they politely and expeditiously correct the problem, no charge.

Always check the FAQ topic first. You can start with the misfire troubleshooting page there.