Without knowing whether you are in the primary or secondary stage, here is the best practice. Usually with a primary fermentation with pulp, grapes, etc, it takes 14 days to complete fermentation. You can crush the pulp around day 7 with very clean hands (although it is recommended that you use a sanitized spoon to crush the fruit against the side of the primary). Never have any fruit in secondary fermentation, as it can ruin the wine. Wood chips (oak for example) are okay.
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