Should my husband wait until Tuesday to report his TM30 in Chiang Mai, or is there a chance the office will be open today?

Good morning everyone, my husband arrived yesterday afternoon in Chiang Mai, from Laos. He wanted to try reporting himself with a previous TM30 slip and a lease agreement. On Google maps it says the the immigration office is closed today, on Saturday, as it will be closed tomorrow and probably on Monday, as it's a holiday. Should we wait till Tuesday, or is there a chance TM30 person will work today?