In that eternal moment it sounded like thunder, reminding him that today time isn't on his side.
versus
In that eternal moment it sounded like thunder, reminding him that today, time isn't on his side.
From what I understand and believe to be right, the comma isn't supposed to be there. The problem is that without the comma it's difficult to parse and during the first time of reading, the word "time" seems misplaced.
Can I place the comma there and still be grammatical or should I rather not and let the reader parse the sentence without any help?