These are plants that have evolved to survive sparse rains and watering. They’ll be okay. Especially your cactus will be. Succulent will probably need water, but I wouldn’t worry too much. If you left an alocasia, philodendron, or calathea, then you should absolutely panic

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? when did you leave and when do you go back?

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It depends on the species, how long you’ll be gone, and the substrate it’s in. I have some I genuinely water like once every month that are fine and others that drop leaves if I blink wrong. It will likely be alright so long as it had the proper conditions before you left.

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