The following example is from this video. It is at 5 minutes and 48 seconds.

You are killing it lately.

I am confused because as this dictionary says the adverb is usually used with perfect tenses, shouldn't have the teacher said the following?

You have been killing it lately.


You are right, the teacher might as well have said: "have been". Both describe a new and/or temporary situation, which has been/is occurring lately.

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