Any proportion of daylily seeds that have seed dormancy will likely not germinate before winter. Decades ago they were, apparently, typically sown in fall but germinated in spring, hence the early studies on daylily seed stratification. If the seeds do not have seed dormancy, or that dormancy has been broken by damp chilling in the fridge, then they most likely will germinate before winter if sown in fall. In other words what they will do depends on their dormancy status before planting in fall.
