"Safe" in security is always relative. Safe from a military hacking attack? Probably never. Safe from random scriptkiddies? Yeah, probably even if you don't run Zoom with a separate user, as long as you got the rest of your shit together. Safe from people buying/using 0days? Seems so, since this issue was never actually disclosed (yet) so it's not really a 0day, so it'll be harder to for people to exploit.

You'd need to understand who/what are your threats to understand if you're "safe" or not.

No, as this discussion points out you should use the browser version if at all possible. The snap version would also offer a little bit more sandboxing probably if you're willing to edit the config for how much access it has to your system.