Harvesting the wine is essentially separating the lees and the wine in the most effective ways. Since this is only a small volume and DIY at home, most effective way may not be the easiest or most productive way.
But it works:
Scoop the top floating bunch out first and set aside; pour out the more liquid portion into the sieve. You can lift up the sieve and swirl/gyrating it slowly to drain out the wine quicker. And no, you must not leave it alone to drain by itself because the lees are very dense and gummy, and will block the sieve. By swirling and gyrating it, the lees will pile up into a ball and at the same time will press against the sieve. This will squeeze out the wine more quickly and thoroughly.