The MongoDB Homebrew Tap README suggests a default install will:

Install the latest available production release of MongoDB Community Server (including all command line tools).

However, this is no longer true with MongoDB 4.4 where the MongoDB Database Tools (mongodump, mongoimport, ...) are not included in the standard server installation.

I just tested with 4.4 GA and the only files in /usr/local/Cellar/mongodb-community/4.4.0/bin are:

-r-xr-xr-x 1 homebrew admin 7693 26 Jul 01:18 install_compass
-r-xr-xr-x 1 homebrew admin 38635440 26 Jul 01:07 mongo
-r-xr-xr-x 1 homebrew admin 58900348 26 Jul 01:19 mongod
-r-xr-xr-x 1 homebrew admin 45672868 26 Jul 01:19 mongos

The README should include information on how to install the Developer Tools, ideally via Homebrew rather than the MongoDB Download Centre.