Before proceeding further with the wing shaping, you'll want to make some small adjustments to the way the wing is structured. These adjustments are aimed to make for a less messy boolean operation later on.
Next, we'll need to round out the wing tip. Start by slicing a vertical strip using the knife tool at the points indicated by the arrows indicated above. Then select and join the vertices encircled above.
Notice that the segments we tried to align early on are now again misaligned. That's okay... It will be easy to re-align once more after we do the boolean operation later on to remove the part of the canard hidden inside the fuselage.