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general::
Phrase(s): (Things) couldn’t be better.
Go to (It) couldn't be better., Phrase(s): (I) couldn’t be better.
Inf. I am fine. • John: How are you? Jane: Couldn’t be better. • Bill: I hope you’re completely well now. Mary: I couldn’t be better., Phrase(s): (It) couldn’t be better. [and] (Things) couldn’t be better.
Everything is fine. • John: How are things going? Jane: Couldn’t be better. • Bill: I hope everything is okay with your new job. Mary: Things couldn’t be better.
McGrawhill's American Idioms And Phrasal Verbs