I am very sorry to hear about Grady.
Well, all of the liver enzymes are exceedingly high. However, the liver enzymes only tell us about liver damage, they don't indicate what would be impacting the liver.
I do agree, that these values are very high and that Grady should be hospitalized. But, with finances an issue, I can understand if that is not possible. AT the minimum, I believe doing the ultrasound is critical. Don't worry about treatment and chemotherapy yet. Just focus on getting that ultrasound done quickly as it may be able to give some good clues as to what is going on with the liver and gallbladder.
Unfortunately, these are very serious numbers, and I would not recommend trying a wait and see approach. I also can understand the vets suggestin to start antibiotics as well. Right now, I would say the prognosis for Grady isn't great because of how high are the enzyme values.
The ultraosund would really help to know more so you can make some next decisions, even if that have to includes euthanasia.
Very sorry that Grady is not doing well but I hope that information helps