If my ebay item was dispatched before 4pm, does that mean it will get here tomorrow?

It was 1st class,
one of the items I ordered Saturday and was dispatched this morning
another I ordered at 12pm today
Both orders I have been messaged has been dispatched and both are royal mail 1st class.
I live in the same country as the order comes from (England), will it be here tomorrow?
I'm asking as my iphone will not function without my orders.
10points for clearest, best answers.

Yes, it should as long as the thieves at the royal mail do there job properly.
The main issue is that the sender did actually get it in the post correctly, good luck

First class doesn't guarantee next day delivery. They might make it tomorrow; if not, Wednesday is likely.

Depends most likely by Wed/Thur

On their website, Royal Mail says "next working day delivery, including Saturdays"

Now is that a 100% guarantee? No.

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