There are three places to check:

• Stripe > Connect - a connected location is a green button with a check mark; an unconnected one says Connect <name>. "Connected" here means Stripe returned an account ID and a live secret key (test-mode keys do not count as connected).
• Stripe > Account Settings - loads only when an account exists and shows a status badge (Completed, Action Required, Payouts Disabled or Restricted) plus whether Payments and Payouts are Enabled.
• Business Settings > Integrations > Stripe - the card reads "Stripe is connected." with a link to Stripe Account Settings when connected, or shows a Connect Stripe button otherwise.