https://tvline.com/2021/03/01/greys-anatomy-ending-no-season-18-ellen-pompeo/

“I can’t say” one way or the other, she said in an interview with CBS Sunday Morning (https://www.youtube.com/watch?v=BStD57jqm7A). “We honestly have not decided. We’re really trying to figure it out right now.”

Grey's Anatomy boss: We're approaching the Season 17 finale as if it were a potential series finale (https://www.hollywoodreporter.com/live-feed/greys-anatomy-boss-approaching-season-17-ender-as-potential-series-finale)

"I'm planning a season and a finale that could function as either a season finale or a series finale," showrunner Krista Vernoff tells The Hollywood Reporter. "I'm planning for both contingencies and it's hard and it's not ideal. It's not where I wish we were." The Hollywood Reporter reports that ABC has been having renewal talks over Grey's Anatomy for months. So Vernoff is handling the uncertain future with two contingencies.