MB3 19a: Specific Activities that are Permitted to be Begun on Erev Shabbos (252:5)

Melachot that if begun on Erev Shabbos can continue on Shabbos itself. E.g. applying mugmar to clothing on Erev Shabbos and putting grapes, olives, etc. into a press on Erev Shabbos. Starting a washer or dryer right before Shabbos.