How does "Temp to Hire, duration of temporary period: x-y months"

So here is my situation, I am an f1 visa and there is a set deadline by which I need to start employment (workdate) by. I have officially accepted a position at the company through a staffing agency. I may/may not get a better offer that is permanent through another company practically a week or two later. Would it be wise to do something like this where I would leave the job quite literally in 2-3 weeks if end up getting the better offer? I wanted to know your opinions. Is the contract binding? I don't see anywhere in the agreement that it is binding.

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Would I put myself in a bad situation by doing this?

I am working in the biotech area.

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EDIT: made a slight typo in my post: I mean to ask

"How does "Temp to Hire, duration of temporary period: x-y months" work?"

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