Meaning of ‘Finish off’ Phrasal Verb in English

I'll finish off my work and then join you for lunch.

He worked late into the night to finish off the report.

She wanted to finish off the painting by adding some final touches.

The team needs to finish off the remaining tasks before the deadline.

To finish off the project, we just need to review and proofread the document.

The chef used a blowtorch to finish off the caramelized topping of the dessert.