Agents can already do the review by themselves. I'd be surprised they review all of the code by hand. They probably can't mention it due to the regulatory of the field itself. But from what I have seen agentic review tools are already between 80th and 90th percentile. Out of randomly picked 10 engineers, it will provide more useful comments than most engineers.
the problem with LLM code review is that it's good at checking local consistency and minor bugs, but it generally can't tell you if you are solving the wrong problem or if your approach is a bad one for non-technical reasons.
This is an enormous drawback and makes LLM code review more akin to a linter at the moment.