How to get all match_status descriptions through the SDK?

You can only get the current status of the match by calling the getMatchStatus() method, for example (Java SDK):

Match match = (Match) message.getEvent();
match.getStatus().getMatchStatus();

If you need the complete dictionary of all possible match statuses and their descriptions, you must fetch them directly using the REST API endpoint: GET /v1/descriptions/:language/match_status (e.g., /v1/descriptions/en/match_status for English).