They have already laid out a fixed schedule of deliveries under contract with BARDA. Only questions are whether those were based on governments fiscal year or SIGA's, and how many courses are delivered under its scheduled shipment date.
Should be 4-6 weeks out now from this huge milestone. Would be a great time for BARDA to announce an RFP for the remaining doses they need. The best part is with such a short shelf life SIGA could be producing millions of replacement courses for years.