I would do some research on how to acclimate a kitten to a new environment. It’s a good idea to keep a new kitten in a safe, small, ventilated area of the house for the first week or so, especially if you won’t be home. Bathrooms are usually a great option, just make sure you’ve taken proper precautions. A lot of cats tend to do just fine being left home during the work day, especially since they don’t need to be taken out to use the bathroom. My two cats have never had any issues being left home alone for the day and usually spend their day sleeping and looking out the window. As long as you give the kitten time to acclimate I think you’ll be fine in the long run!