According to the recent statistics, the photo of Lionel Messi, who was celebrating the victory of Argentina in the 2022 FIFA world cup, has received more than 74 million likes and is therefore the most liked Instagram post of all time.
Instagram itself does not have a global ranking feature and thus to see the latest most-liked posts one has to visit updated lists on websites such as Wikipedia List of most-liked Instagram posts or articles that monitor social media records.