Royal Mail tracking is sometimes not in sync with eBay's tracking, and the latter is the most important for releasing a faster payout, that is, 2 days after the delivery date.
If you have found your tracking has not updated, therefore holding back your payout, you are doing the right thing by contacting eBay Customer Services, providing the tracking showing delivery, to release your payout sooner, otherwise it may be a longer wait.
It's annoying I agree , and others are experiencing this too, you are not alone.
@jackuk-sk7k5ud