Can't I just hand over my packages to our scheduled postman?

Hello All,

I’ve been using UPS because in my experience they are more reliable than the USPS. However, I am expanding my business and opening a physical location. I will be in a small strip mall with two other tenants and I noticed that they have scheduled USPS visits to drop off mail. I was wondering if I switch to USPS instead, can I just hand over my packages to the mailman instead of scheduling/paying for a pickup via Shopify?