have arrived now?

Yes, it makes sense. The word "now" does not make a huge difference to the meaning. It adds a sort of sense that something expected has now happened.

It's fine. It suggests that the bus arrived very recently.

GPYThe word "now" does not make a huge difference to the meaning. It adds a sort of sense that something expected has now happened.

Would it make sense, GPY, if we use "just" and "now" together in that sentence?

Eg The bus has just arrived now.

LaboriousWould it make sense, GPY, if we use "just" and "now" together in that sentence? Eg The bus has just arrived now.

It seems slightly redundant, but I think it's possible you might hear this in conversation.

Thanks to you!

Actually, I thought that adding 'just' to the original sentence "The bus has arrived now" would change its meaning, but I wasn't sure about it.

Do the sentences "The bus has arrived now" and "The bus has just arrived" have the same meaning(s)? Do both the sentences say that the action (of arriving the bus) has happened / occurred recently?

The bus has arrived now suggests that there may have been some earlier discussion about the bus not having arrived. The bus has arrived since the previous discussion. The bus may have arrived in the past two minutes, or it may now have been there for an hour.
The bus has just arrived would normally suggest that it arrived very recently, within the last couple of min