A couple of things, but the first one is: don't do this.
The question is: Why?
A) 470uF is a lot of capacitance and is more likely to hurt than help
470uF can take a while to charge up. Most chips have a supply voltage specification that the voltage MUST rise at a certain rate or the reset circuitry will malfunction. That much capacitance could slow you down far enough that you might not meet the specification.
A 470uF capacitor will probably have quite a bit of series resistance and so won't supply current as quickly as you think it will.
A 470uF capacitor is probably pretty big and expensive.
The nrf24L01 only pulls 10mA MAX. There is no way you need a capacitor that big.
B) The inherent power on reset takes a non-deterministic amount of time. It can be up to 10.3ms for the nrf24L01 (see the datasheet)
C) A capacitor that large is rarely useful for RF circuits as the capacitor likely has a terrible high frequency response.
Given all this, the question becomes "What should you do?"
What you should do is read one of the nrf24L01 registers.
The nrf24L01 has several registers that come up with useful bit patterns so that they can be distinguished from a chip that hasn't powered up yet.
Register 0x0A defaults to 0xE7E7E7E7E7. Register 0x0B defaults to 0xC2C2C2C2C2.
Both of these bit patterns have transitions which means that you can distinguish them from a stuck bus. If you do a read and don't get the expected value, the chip hasn't come up yet and you should wait a bit and do a read a little later. If you do a read and do get the expected value, the chip is up and you're ready to go.
Hope this helps. Good luck.