The Custom domain page of a Store or a website now starts with a label saying where the address stands: Live, Not live yet, or Problem found. Under it are the three setup steps (prove the domain is your team's, point the address to Magpie, and the security certificate), with a tick on each step the last check found done and a mark on the next one to finish.
The _magpie-verify TXT record also stays in the DNS records table, marked Found, after the address goes live. Before, it was removed from the table, and the page gave no sign that it had been found.