No worries about it sitting too long until we're meauring time in months, not days or weeks. You have at least four weeks, likely more, until autolysis might possibly come into play.
How long has it been since you brewed? Generally, one week in primary, two in secondary, three in bottles. Since you aren't doing a secondary - and that's fine for a witbier - I'd be inclined to lean towards two weeks in primary before priming and bottling, with a gravity check before bottling.
Are you still seeing bubbles? If you see any, it's still fermenting, so let it keep working.