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Yeah it's not a bad performance, they're gaining momentum and to be honest I didn't believe in them at all that they could come close to these results. I wonder where they will finish this season, I think the top 5 or even 6 is already closed for them a priori, there is too much competition and it is unlikely that they will be able to get there
I also don't believe Chelsea have good record in the last 8 matches, because at the start of this season some of their matches were quite disappointing, especially when they lost against a weak team I mean Nottingham. Chelsea played at home and had many golden opportunities, also dominating the match but they lost.
Actually I can't answer that either, because the Premier League very competitive, and the points currently Chelsea achieving are not very convincing. So yes the possibility is not too big for Chelsea to end this season in top 5th or 6th, but also there is still a chance for them because their performance is also getting better.