All 3GPP discussions are archived in ETSI LISTSERV. There are a number of lists as 3GPP Technical Specification Groups (TSGs) and Working Groups (WGs) have their own rolls and responsibilities. For example, radio access network (RAN) includes lits, RAN, RAN DRAFTS, RAN1, RAN1 NR, RAN2, RAN3 and RAN4. There are other RAN-related lists also exist, but these are lists you may want to focus on.
On the other hand, keeping up with the lastet discussion via suc a web interface makes you feel inconvenient. Lists maintain discussions per week basis and it is difficult to follow up discussions seamlessly. Fortunately, LISTSERV lets you get notified via an Email. After you access a list you are interested in, you can subscribe the list by clicking subscribe and providing your Email addres you want to use.
You should note that these methods allow you to only keep up with new incoming discussions. You need to find the past discussions via the LISTSERV web interface.