This season will probably still be quite difficult for Newcastle to become champions in the Premier League, even though yesterday Newcastle was able to win a lot at home to Sheffield United, who are currently at the bottom of the standings. But Newcastle can try to reach the top four this season if Newcastle can continue to be consistent with their good performance, because this season Newcastle are also thinking about how they can continue to compete in the UCL until the final.
Yes, I also agree with you regarding Newcastle's chances of becoming Premier League champions, even though they are making a strong comeback to regain their glory. However, to secure the championship, Newcastle will need more than what they currently have. Nonetheless, finishing in the top 4 this season would still be a commendable achievement for them.
Pochettino needs to think fast because they'll be facing Brighton in their next match at Stamford Bridge, but they're going to get it very tough, because Brighton have been in a very good form this season, and if he continue losing he might end up losing his managerial role very soon.
The pressure is mounting on him, and it's not hard to predict that Chelsea will lose their next match. I suspect that Mauricio Pochettino might be sacked if Chelsea continues to lose, especially against Brighton in the next game.