Jennie from Shopify here! If you are using Shopify Payments to accept credit cards we automatically transfer the money from your order to your bank account 3 days after you receive an order. Sometimes your bank takes an additional day or so of processing. You can view your upcoming payouts in your Admin by going to Settings -> Payments -> View Payouts.
You can read more about Shopify Payments here: https://docs.shopify.com/manual/more/shopify-payments/faq