The current consumption of the board will depend on several factors:
- whether the board is in sleep mode (deep sleep or light sleep) or not
- whether the camera is working (streaming) all the time or just a frame once in a while
- whether the board is connected to Wi-Fi all the time or not
- and if it is connected to Wi-Fi, whether power management features (automatic light sleep, DFS) are enabled
The answers to this depend a lot on the use case and what software you are using.
For example, if the camera is not supposed to take any pictures during the night, you can probably run it off a relatively small battery.
If it needs to stream over Wi-Fi all the time, then the current consumption will indeed be close to the number you gave.