Rcvng money on my Apple Pay wallet is it immediately available

Generally, yes. Occasionally I've had lapses that might be because of network issues or something like that.

But if it's cash-to-cash transfer it's generally immediate.

However keep in mind this from Apple's Support page:

Account security checks might require additional time to make funds available.

https://support.apple.com/en-us/HT207875

Good luck 🙂