You're not the only one.
Others are reporting different times for payouts to be received, too.
Sometimes, for example , if a sale is made that has more value than previous sales, this can cause that payout to be delayed a little longer to ensure the buyer has received said item.
Otherwise, no rhyme or reason, for an established seller with regular sales not to have that payout made on time. 🙄
@ashwill-3742