SelluSeller (OMS) orders pushed to Wareo (WMS) delay cause may due to the orders are in partial state at SelluSeller (OMS). The partial orders can't be pushed to Wareo (WMS) until its under "Ready for Pickup" status.

Whenever the orders got updated as "Ready for Pickup" status in SelluSeller then it will be pushed to Wareo (WMS) for process.