Great question. This could be showing up for a variety of reasons. This could potentially be a third-party app that you installed to show a processing time on your product pages. Otherwise, this would be a built-in feature within the third-party theme. In this case, what you can do is go into your admin > online store > themes > click the 'actions' button > select 'Edit languages'
From there, you can search for that text in the search field to find and replace it. Example shown below:
Let me know if that helps! If there is anything else I can help you with, please let me know.
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