Can my daughter and her boyfriend get a visa on arrival or visa exempt for Thailand?

Hi all it’s really difficult times to get accurate in date information,

My English Daughter and boyfriend have been in Vietnam about three weeks and before that New Zealand, they want to come here ASAP to stay with me,

Does anyone know if they can still get a visa on arrival/visa exempt, and if they can’t can they still come if by buying a visa, things are changing so quickly it’s really not easy for us to find the information,

Thank you in advance Mike

Also please forgive me if this question has been asked before we are panicking a little and haven’t checked all the post below,