It's nice to see you posting your concern in the QuickBooks Community, tracey3. Let me share further details about creating an invoice template in QuickBooks Online. Then, to ensure you can accomplish your goal in setting up an entry at a later date.

Yes, the details mentioned by my peer Divina_N about setting a recurring template as Interval and Weekly are the steps to set up an invoice. Then, the entry will automatically send to your customer every Friday. 

However, if you only want to send the invoice to the customer on a later specific date, I recommend setting the start and end date. This way, the recurring will stop sending on the end date you've set up. I've attached a screenshot below for visual reference.

Lastly, you may refer to this article to view details on how the Sales page provides you information on the status of sales transactions like open and paid invoices: View sales transactions.

Let me know if there's anything else you need help with managing your invoices. I'm always here to help you anytime. Take care and keep safe!