Prime Eligible Units

Hi everyone,

Relatively new to Amazon so still learning what some would call ‘the basics’! We restocked a product, which was received yesterday by Amazon. For some reason we have an extended delivery time compared to the other FBA seller on the listing. Looking through our shipment tabs I came across the following box attached. I presume that the units do eventually become ‘prime eligible’ as I presume that’s what happened the last time we restocked. However, I do not remember us having the delivery time issues for as long last time. I know it’s only been one day, but just wondering if anyone has had to wait like a week for their stock to become prime eligible before? Could this take an extended period of time in some case?

Hope this makes sense, thanks!