Set realistic expectations and deliver.
You’ve now got a relationship with your supporters and it’s incredibly valuable to continue to provide them great service - they’ll be your best asset in the future. You've already set a timeframe for the delivery of your rewards when you started the campaign, if this changes at all it's up to you to let them know and be transparent with any delays.
Communication
Don’t leave your supporters in the dark. If there are delays, let everyone know. People will understand that what you are doing is new and unprecedented and they won’t mind waiting a little extra time for their rewards, provided they know what to expect.
Collect Information
Collect all your supporters' shipping addresses and reward selections. The best way to get all this information is to download the spreadsheet from your Supporters tab within the Project Editor.