The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
A randomized controlled trial involving 12 young healthy men showed that late afternoon endurance exercise 16:00-18:00 (compared to morning endurance exercise 9:00-11:00), promoted a reduction in blood sugar peaks following meals as well as a reduction in fats (triglycerides) in the blood, indicating a metabolic advantage for exercising later in the day (6).
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And in fact, there is at least one study that came out of Stockholm showing that the same people, when they did exercise high-intensity interval training in the morning versus the same people doing the same high-intensity interval training in late afternoon, they found that people who did the morning, when they did the morning HIIT interval training, the blood glucose level actually went up, whereas doing the same exercise in the evening helped them to reduce their blood glucose level, 24 hours blood glucose to those who have diabetes.
So the bottom line is, whether you're healthy or less healthy, it seems that late afternoon, early evening exercise is better.