UPDATE 30/9/20: Transferring creatures from Pokémon Go to Pokémon Home will come with a cooldown period you can shorten by paying PokéCoins.
The suggestion this process might include a paid-for element was raised yesterday by a Japanese support article posted by The Pokémon Company which referenced undetailed PokéCoin costs. (PokéCoins are the premium currency used in Go which can be earned in small amounts daily or bought using real-world money.)
The Pokémon Company has now updated to say the payment refers to the ability to shorten the time between transfers to Pokémon Home (thanks, Serebii). Exact PokéCoin costs and cooldown timeframes are yet to be detailed.