Nextcloud 14.0.1 available now.
 Nextcloud 14.0.2 available now.
 Nextcloud 14.0.3 available now.
 Nextcloud 14.0.1 available now.
Nextcloud 13 Update
Yes, moving to NC v14 and altho v13.0.6 is out, now v.14.0.1 is a stable one.
Generally, NC v.13 to v.14 upgrade on the standalone system goes without a hitch.