In my opinion, there is no way to predict the check in wait time. You might arrive at 2 am and there be one person in line in front of you, but only one desk agent. If that one person has a check in issue, you’ll wait a while.
Alternatey, you might get there at noon and have 6 people in front of you and 4 desk agents. If things go smooth, it won’t take long.
On the day pictured, there were likely a lot of people that showed up at a different time and had little to no wait.
Choose the flight you want based on timing and pricing that works for you. I wouldn’t try to factor in check-in when there are too many variables.