Singular: %2$d back-in-stock notification is now <a href="%1$s">queued for delivery</a> in the next few minutes.%2$d back-in-stock notification is now <a href="%1$s">queued for delivery</a> in the next few minutes.
Plural: %2$d back-in-stock notifications are now <a href="%1$s">queued for delivery</a> in the next few minutes.%2$d back-in-stock notifications are now <a href="%1$s">queued for delivery</a> in the next few minutes.