We are flying Delta in December, and I joined sky miles. Will we be able to come in to one of the Delta Lounges for our long layover in ALT?

Only if you're Sky Priority. If not you will have to pay a fee to get in.

It must be with a member for 29

You will have to pay a $29 fee

What Brandy said. Or Amex plat.

You will need Sky Club membership or $59 per visit (it was $59 or $49 prior to the lock down.)