Delta is all but gone. Pretty much all infections today are Omicron.
That said, on of my mom's old college friends, in her early 50s, died on Sunday, presumably from Omicron. So if you're not boosted, you should be taking it seriously regardless.
I've only known 2 people personally who have gotten Omi. Both are from work. One upper 40s... one lower 60s. Both said they could have come back to work with it. Just felt like a bad cold.