It is looking uncertain whether this fight will happen. Pacquiao is being sued by his manager Audie Attar for breach of contract. Attar's company Paradigm Sports was negotiating a Pacquiao vs. Mikey Garcia fight when Pacquiao instead decided to sign a contract for the Spence fight.

https://theathletic.com/news/manny-pacquiao-faces-lawsuit-saying-he-veered-from-mikey-garcia-for-errol-spence/42bUGIF0hGnL