Kansai security line timing?

We are flying United out of Kansai to San Francisco on December 31st at 6:30 in the evening. I have seen multiple posts that are a bit old about very long times to get through security. I am looking for advice from anyone who has flown in the last few week sor so.

Has anyone flown United Polaris and can tell me what the bag check is like? Is there a security line for Premier/Business class? If so, are the security lines still absurdly long? Is arriving three hours before the flight enough time?

Thanks in advance!!

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