It means he has about a decade to reach a strength that he can take on any supreme, even the peak sixth-order supreme, and a century or so to face the almighty Sovereigns who dominated eras with their terrifying talent and strength.
If anybody heard Apollo's thought, they would call him mad, a psycho not understanding the meaning of 'supreme' and 'sovereign', but he believed it was possible. Maybe extremely difficult but not entirely impossible for him.
Now, he already has a goal to achieve, but first he needs to find a way to hide his strength and improvement in front of the Creation list. So, he decided to see the creation list with his own eyes and see what it actually is.
He didn't wait much as he spent a day with his family and left the very next day. He is also going to look around and see the changes of Rion with his own eyes.
He didn't travel by tearing through space; he flew normally. Even then, his speed was faster than eternal gods.
