https://www.animenewsnetwork.com/daily-briefs/2019-12-08/dr-stone-manga-has-important-announcement-on-december-16/.154093
Since there’s only 1 more episode & things look to end on a cliffhanger, pretty much guaranteed to be an official announcement of Season 2 (or a movie if they follow the example of Demon Slayer, Made in Abyss & Kabaneri of the Iron Fortress).