Quick question guys: after staking, rewards can be claimed after the first 10 days?

Staking Partners are accepting delegation now, but the protocol updates required to activate the new validators do not start until epoch 239 on April 5th. The validators need to be active for a day or two before they will start generating rewards which will arrive in the wallet between April 7 and 9.

Have a read through the time line here my friend, ones rewards have started to be paid 7-9th April then they get paid each day https://elrond.com/blog/elrond-staking-phase-3-upgrade-details-and-timelines/