Ok? That cliche is true of every single problem on Earth.
It’s not even true if you want to be pedantic about it
The quote is actually “the best time to plant a tree was 30 years ago. The second best time is today”
29 years ago, 28 years ago … all better than today. There are an infinite number of times better (and worse) than today.
Sometimes it's helpful to write things or say things out loud even if they're obvious. Like my comment right now.