I don’t think it matters, it’s really up to your form of practice. Some people do, and some don’t.
However if you do choose to give offerings… It’s unwise to give one UNTIL the demon/spirit has successfully done their work. Least in my opinion. So offerings should come after the spirit has delivered.
I personally don’t do offerings anymore. Least not as a requirement. Every now and then I will do a piece of art dedicated to said spirit as a form of appreciation and continued friendship/etc. Kinda as a thanks for working with me, and continued hopes to work together/maintain friendship.