Later analysis will reduce your total number; a rigorous selection/inclusion process is key to a good review
It may feel that there are always more sources to track down, and in the case of a field that's rapidly developing, that may be true! However, your paper has to be completed eventually, so your search plan has to include the point at which you stop collecting new citations.
This is an image of the spreadsheet I used to track dozens of articles for a research article literature review. Your needs may vary, but attached below is a template of this spreadsheet for you to use yourself, if it works for you.