This AppleScript will reveal the recently captured screenshots in the Finder. If the Finder is already active, it will bring the Finder to the frontmost, open a new tab, and navigate to the folder containing the screenshot.

README.md

To activate this script:

• save the script to the folder users > your-username > Library > Workflows > Applications > Folder Actions
• go to the folder that stores your screenshots. Right click to bring up the context menu.
• select Servicess > Folder Action Setup.
• select the script that you save in the first step.

The script will be triggered whenever there's a new item added to the screenshot folder, i.e, whenever you take a new screenshot.

If the Finder is already active, it will be raised to the frontmost, open a new tab, and navigate to the folder containing the screenshot. That way, you don't end up with dozens of Finder windows.

reveal-screenshots-in-finder.scpt

on adding folder items to theFolder after receiving theNewItems
    --  Called after items have been added to a folder
    --  theFolder is a reference to the modified folder
    --  theNewItems is a list of references to the items added to the folder 
	tell application "System Events"
		set activeApp to name of first application process whose frontmost is true
	end tell
	tell application "Finder"
		# Bring the application to the front, launching if necessary
		activate
		tell application "System Events" to keystroke "t" using command down
		set frontmost to true
		set target of front Finder window to theFolder
		reveal theNewItems
	end tell
end adding folder items to