How long will my tires last???

I’m a 20 yr old F DoorDash driver. I NEED my car to do my job, I don’t really have any savings given I’m in college and DoorDash is a side hustle.

I make just enough usually to pay off my car payment every month, but I recently had my back right tire patched because it was leaking, when they were done they said that my tires needed replaced immediately and that my back tires were at a 2/32 while my fronts were at 4/32.

They then gave me a quote on how much it would cost to get done and it ended up being $1000, I can’t afford that kind of thing let alone do that AND my car payment.

Not to mention that I need my car in order to do my job in order to PAY for my car and NOW apparently I need super expensive tires.

So how long can I still work??? How long will they last? And in what conditions can I still drive with them??