You can get disk usage on MacOS by using du command.
$ du -d 1 -h
200M ./Amazon Music.app
6.1M ./Android File Transfer.app
1.9M ./App Store.app
...
-d option means depth. du outputs result for all files which is too much, so -d 1 option is needed.
-h option means human-readable. This option add unit suffixes such as Byte, Kilobyte, Megabyte, Gigabyte.
Filter by unit
If you want to filter result by unit:
du -d 1 -h | grep -e "\dG"
2.0G ./iMovie.app
1.3G ./iPhoto.app
8.2G .