Stroman has a $21M deal for 2024. He may opt out, but I'd not assume so.
If he does, it will probably mean that he's had a healthy and productive 2023 season.
$21M is essentially the value of the qualifying offer. Barring massive injury, I think the Cubs would be glad to see Stroman renew for a single year at a QO price, and then be eligible for a QO the year after.
Getting multiple single-year contract options on a solid #3, athletic pitcher, who is only 31, is a great deal of value and flexibility for the team.