All in all, these shipping update emails are great because they allow you to provide additional opportunities to stay top of mind, offer customer support, and even market other potential products that customers may be interested in.
These emails are some of the highest opened emails. Take advantage of the opportunity to cross-sell/upsell like the email below.
However, it’s important that you remain compliant. Don’t be overly sales-y or promotional in these emails. The more subtle (and secondary) the cross-sell is, the better.