You could wait until tomorrow or monday to feed if you want to. When I got my 2 beardies, I offered salad as soon as they were in their tanks. Granted they didnt eat it but it was there for them if they wanted it. I also fed them dubais and crickets the same day I got them home and in their tanks. They absolutely tore the insects up. So its really a personal choice. No need to be alarmed if they dont eat right away of course.