The phrase "earliest opportunity" means as soon as possible or without any delay. It is an idiomatic expression that emphasizes the urgency and importance of taking action at the earliest available moment, rather than waiting until some later time.
Sentences with «earliest opportunity»
This approach was expected to lead to earlier opportunities for agreements or treaties. (humanrights.gov.au)
As in the example above, look beyond the specific legal problem you hope your clients will hire you to solve to find earlier opportunities to show them how you can help. (lawyerist.com)
They should be seen by a veterinarian at the very earliest opportunity. (petwave.com)