Sounds like you're in a pretty good position to get cat honestly. Some prefer to live with other animals but others are completely content being the only pet. They're fairly independent and would be totally fine with you being out of the house for work every day. A nice advantage of getting a cat that's in foster care is that the foster parents have a really good idea of their personality and can help you find a good fit for your life. It's generally not a problem to leave them for a few days, ideally cats should be getting more wet food than dry food, but every once in a while wouldn't be a problem. I would say go for it, they bring a lot of joy to your life