Home assistant currently uses OpwnZwave version 1.4, which is no longer supported. Basic functions generally work out of the box, but for working configuration or scenes, some additional work is needed.
- Download the most recent OpenZwave 1.4 config files from github. This post has general information on how to do it.
- Configure the Zwave config_path in HA to use the zwave config directory downloaded from github. Link
- Manually edit the manufacturer_specific.xml file to add the missing Inovelli devices (they have not been added to the main github repo yet), and add the missing xml files to the config/inovelli folder. Link
- Once your devices have been added and are using the latest config files, you will need to stop HA and edit your zwcfg*.xml file and add some information to get working scenes (OZW 1.4 does not natively support scenes). Link
Eventually, HA will move to OZW 1.6, which should make things easier. OZW 1.6 supports automatic downloads of config files, and has native scene support.
As far as lead time on orders, it probably depends on your location, quantity, and type of order. My most recent order was placed on 1/28/2020. It shipped on 1/29/2020 from Michigan, and arrived at my house in Oregon on 2/1/2020.