Every change you make will take some time to be reflected on Google's end. Some changes might take effect in a few hours, others could take several months. In general, you likely want to wait a few weeks to assess whether your work had beneficial effects in Google Search results. Keep in mind that not all changes you make to your website will result in noticeable impact in search results; if you're not satisfied with your results and your business strategies allow it, try iterating with the changes and see if they make a difference.