Normally you would do it when dormant but the tree looks so awful that I would do it now. Also that would leave less growth for the roots to support so the suggestions of watering will be more effective. You will have a better root:shoot ratio.
Hi, how long ago did the leaves shrivel? If it's reletively recently, like the last couple of weeks, then it can take a while for new leaves to form. If it was quite a while ago then the chances of it still being ok are less but follow the good advice from the others above.
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