Tesseract works. Not sure if its "good" compared to SOTA. There's a port of it to Android on F-Droid called simply "OCR".
Ooof. That's not great. My hand writing is not great, but... Oof.
Hah! My cursive is indecipherable even to me the next day, but I can print just well enough that the bots can get it 90% right. Still quicker for me to type, even on phones...