What's the weather forecast?
If heavy rain is expected, I'd pull now.
If it looks like it's going to be dry, I'd leave them.
Light rain? Less than 50% chance of rain? Judgment call. I'd probably pick some, if any rain is forecast.
I haven't grown garlic for a year or so, but I do grow onions, which should not be watered for a couple weeks before picking. So my recs are based on keeping them dry for a couple weeks just before picking.
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