Conditional trigger split by fulfilment status

Hi all, 

I would like to include an conditional trigger split of the fulfillment status (we using shopify) in my already existing customer thank you flow. 

So if the fulfilment is completed customers get the planned mails of the flow and if not they will get an information about the delay. 

Following adding another trigger of the fulfillment status in the flow a few days later and if the order is fulfilled they get the planned mails of the flow. 

Can someone help me in this case? 

Thanks so much in advance! 
Natascha