What services should I expect from my caregiver?

What you are talking about is a Home Health Aide. Her duties are pretty much what u listed. The person is there for your wife. If she gets her lunch, she cleans up. Cleans up the bathroom after giving her a shower or helps hervwith toileting. She should do all your wife's laundry even soiled items. Also, light housekeeping in the rooms wife uses. She is not required to do anything for you. If you get this help, use that time for you.

I agree that depending on how many hours you need from an aid, and if you're hiring privately, you should have more than 1 person, in case the other cannot make it due to illness or time off.

You’re not expecting too much but you may need to hire two caregivers to rotate time in this role. It’s a lot to care for someone in your wife’s situation and may take more than one person to accomplish, especially considering time away for the workers

You may have to prioritize what you want to be accomplished.

Maybe you can have the aid shadow you for a day before hiring to make sure they totally understand their duties and to see if they're a good fit. Make sure you try to hold out for someone who has experience with ALZ patients. Sometimes people call themselves aids or caregivers because they imagine it's like a slightly higher level of babysitting.

If your wife is a fall risk, you need someone who knows how to assist someone who is unsteady. You need someone who knows how to be patient and creatively get your wife to do beneficial things. Also be clear about "phone breaks" so they aren't looking at their phones every 5 minutes.

Make sure you have a written contract. Is this person going to be privately hired? Or through an agency?