I make it a habit of not watering or fertilizing any new plants right away. I want them to have time to adjust to my conditions. I may water three to five days later after the new arrival has dried out completely. I have lost too many plants due to rot.
They get packed up damp sometimes. Sit in a box for 3-5, sometimes 7 days. Like I said, I want them dry. Then they go on my watering schedule. With all of my Paphiopedilums, Phalaenopsis and Phragmipediums, I repot roughly two weeks after they arrive. Why? Because I want them potted into my mix, I want to get them in the proper size pot, AND I want to see the roots.
Then after the repotting, I am less likely to have any “surprises”!!!
I might fertilize if they look good after a month. By holding back fertilizer, I am not harming anything.
I do that with every single plant I buy, that’s over a 45+ year period.