up to which version rhel kernel will be updated so for example rhel 8 started with version 4.18 so up to which version it will keep updated (i mean the version from the link above)
for other package that updated by back-porting is there away to map the rhel package version to the author version
The last RHEL 8 point update will be released in 2024? What features are available by then is what is theoretically possible to select for backporting. Most features will not be backported.
You can potentially get information on the activity done for the EL kernel here:
The stream 8 kernel doesn’t have the same amount of commits like 9 does, unfortunately. To mirror the previous answer, you can’t really map the rhel kernel version to upstream.