IKEv2 still doesn't work for Windows VPN Clients ☹.
I am using R82 (Release Version) in my Home Lab:
SK166415 Updated on 31st October 2024:

R82 – Global Properties:

If Prefer IKEv2, support IKEv1 is selected, then the Windows Client only uses IKEv1.
CheckPoint VPN Client for Windows E88.60 – Installed on Windows 11 Pro v24H2:

CheckPoint VPN Client for Windows E88.60 – Latest available (CheckPoint Mobile Mode):

In addition to E88.60, I also tested E88.40. There is nothing in any release notes that mentions support for IKEv2.
The only VPN client that I have tested that will successfully negotiate IKEv2 with the Security Gateway is Capsule Connect for iOS.
(I don’t have an Apple Mac or Android device available for testing).