Welcome to the forum.
Take a look at Export into CSV // Selecting what to be exported (which Google found for me searching for “devonthink export search results csv” using the Menu: Tools/Create Metadata Overview. Select any or all of the items in the search results, run the menu command, and then look at the resulting *.tsv file. You can export this file and open in Excel.
This was this week’s DEVONthink “learning” for me.