if I order 340 pcs of lumber 4*4*16. can the store dilivery the next day?

I agree with Alan I don't think Lowe's carries 4×4×16. Check with Pixley lumber. They deliver too.

I would let the pro-desk know in advance...Claremore is a smaller store with a reduced inventory.

I may not be much help. When I think of 4x4x16 lumber, I think of post. I don't think Lowes would have that. I would check Pixley Lumber, if you're checking in Claremore. That's a lot of post, so I probably misunderstand the question.

If there's an open slot.