There is no an advance office schedule to be made. The next day's schedule will be decided depend on the work load for that day. All are to be intimated prior to your working day. Therefore, the office work schedule for the day will be decided prior to that day / the office schedule for the day will be decided on the day immediately preceding it.
This could be clearer. I would say: The office schedule is not prepared far in advance. Instead, it depends upon what the expected work load will be.
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This could be clearer. I would say:
The office schedule is not prepared far in advance. Instead, it depends upon what the expected work load will be. For this reason, each day's work schedule is usually determined only on the day before.