Open-toed shoes for job interviews?

Hi everyone! I have an interview for a secretary position for a school district. I am excited! This position is full-time( I currently work part-time) and the pay is almost $4 more so this is a great opportunity. Anyways, I read online that open-toed shoes are seen as unprofessional? Is that true? My husband bought me these for my interview. Are these appropriate? Also if you have any interview advice, I'll take it! Thanks!