You can open the current terminal working directory and display it in the Finder using:

open .

You might also be interested in knowing how to:

Open the current parent directory in Finder

open ..

Open a specific directory in Finder

open dir1/dir2

Open a file with the default application

open file.txt

Open multiple files:

open file1.txt file2.txt file3.txt

Open a file while specifying the application

open -a preview pic1.jpg