Step 1
From the main screen of your Shopify store, click the Settings tab in the left sidebar > navigate to and open the Locations > click Add location if you haven't set up a shipping location yet, or select and open an existing location if one is already available.
Make sure you tick on the Fullfillment (Use inventory at this location to fulfill online orders) checkbox
Step 2
Still in the Settings tab, go to the Shipping & Delivery section > scroll down to Pickup in store > click on the store you want to configure for pickup > check the box for Location status (Let customers pick up orders directly at this location) > set the expected pickup time, for example: Usually ready in 2 hours.
Don't forget to configure the Ready for pickup notification, your customers will read this information to know the time they can go to the store to pick up the products
The result: you will see the location store shows the Offers pickup tag.
Refer Shopify Document