The Department of Home Affairs publishes the Medium and Long-term Strategic Skills List (MLTSSL) and the Short-term Skilled Occupation List (STSOL), which set the occupations eligible for Australia’s points-tested skilled visas, including subclasses 189 and 190. The lists were updated in January 2018 and change regularly, so check the current lists on the Department of Home Affairs skilled occupation list page before you apply.
The subclass 489 visa closed to new applications on 16 November 2019 and was replaced by the Skilled Work Regional (Provisional) visa (subclass 491).