Schedule your flowers to be shipped to the nearest FedEx Station to hold for pickup.
This way, you can pick up your delivery on your time.
If you've missed your delivery due to leaving your home the exact 4 minutes FedEx arrived, you will need to coordinate directly with FedEx to determine the next steps for redelivery or pickup. Call your local carrier to see if they can redeliver that day, or if you are expected to pick up the flowers that night.
As much as we'd love to mama bear the situation, we are unable to intervene as shipping companies do not allow our involvement. You got this!