I am using an internet Bible that seems to be based on the RSV. Genesis states that certain things were created in a specific sequence. I am following the sequence literally. The SUN is created after the plants. http://net.bible.org/bible.php?book=Gen&chapter=1#n41
By your own version, light was created right after the heaven and earth and before the plants, so there’s no issue with the plants not having the sun.
The Sun was not necessary in Days 1-3, as God Himself said “let there be light”, right from the beginning.