There is no "maximum." You could be on 60 Minutes, and make a fortune. You could be reporter at a struggling newspaper, and need food stamps to make ends meet. Journalism is in a state of flux ever since the advent of the internet. There's no denying that it is a tough field. I worked with a lot of news reporters who lost their jobs. Most of them did not find new jobs in journalism - they transitioned into something else. By the year 2026, it is predicted there will be 4500 fewer reporters nationwide than in 2016. There is a lot of information at this link, including salaries.
This is not to say you should not get a degree in journalism. But I encourage you to do a lot of research first.