According to TV Line,
Ozark season 3 would have ten episodes, similar to Seasons 1 and 2. The main emphasis of Season 3 will be Marty's enormous casino boat, which he plans to utilize to launder hundreds of millions of dollars for the drug cartel in Mexico. At the same time, the Byrdes launch their largest operation yet. We watched Marty and Wendy get their hands even dirtier than ever in the second season, which was an actual triumph.