Good hosting is the key. If you think that the traffic will be high, you will be able to estimate more or less what these values will be. Thanks to this, you will definitely find out whether the hosting will be appropriate.
If your site is a Shopify site, then your hosting is Shopify.
Shopify has an exceptionally resilient infrastructure that handles high-traffic events frequently. Shopify can handle a lot of visitors! You can learn more through this thread.
If your Eshop is built from scratch or with another CMS, you should contact your developer team/ website development agency to check this.
If you feel like my answer is helpful, please mark it as a SOLUTION. Let me know if you have any questions!