Bt is safe on your plants but very effective on caterpillars. Don’t wait to use it. The small caterpillars can leave dead material behind which can lead to rot and mold in those hard to reach sites like buds.
Harvested thw top buds the trices had went white mostly some amber on bigger leaves now thw white hairs had all already went that burnt orange color but to my surprise they grew back white and sticky looking. Cheesy looking stank of lemon with lots of crystals.