They are triplets - look at the time signature, 6 8. 6 8th notes per measure, so the 3 16th notes notes will need to be played in the duration of an 8th note (tri-pu-let).
With that out of the way, let's look at the real question. Do you play the left hand "marginally" after the right hand? If played with the precision and boredom of midi files, we would play this:
Right hand:
v v V v
1—2—3—1
Left hand:
v V v
1 2 3 4 1
Whatever tempo you decide on here, it's very, very fast. Look at the distance between the 3rd v in the right hand and the 2nd v in the left hand. Very, very close. So close that it will probably destroy your flow if you try to play it at the very fast tempo with a "marginal" amount of space after the triplet before the left hand note. I would just play it with the left hand chord. Listen to recordings, that's how most (if not all) of them play it.