Still wetting overnight sometimes

Just wondering where everyone is at with this ! My son's been poop potty trained since 16 months but pee has been harder . Hes known how to pee on the potty since 16 months and did often but still peed in his diaper or underwear in-between. Right now we are on week 2 of just underwear all day with only one accident. The only thing is night time he still wears a diaper because he doesn't always wake up dry. When did your kiddos fully become potty trained? Any other tips for me ? He's doing great and I'm following his lead but I want to make sure I'm also doing everything I can to help him learn.