This flow will search every 7 days if there is a new online version of Node-Red on https://nodered.org/.
If that is the case, [EDIT] : In this new version :
1. Indicates whether a new online version is available. Click on it to start the update : 
2. A wheel that turns to make you wait : 
3. When the update is complete, you can select:
- either an automatic restart of NR
- or (by default) a popup which proposes if you want to restart (or not) in addition to indicating the time taken for the update.
4. After the restart indicates NR is up to date : 
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New: to know the internal version of Node Red, you have the choice between manually entering the IP address of the NR server OR let it do it automatically by adding the node-red-contrib-ip node from the Manager palette.
The output of the array to online node, send :
msg.actualVersion is the running NR version
msg.onlineVersion is the online NR version on https://nodered.org/
Are there in addition:
- A RESTART button
: if you want to restart NR for any reason : - A hidden DOWNGRADE button
: if you want to test with a previous version of NR
Tested on raspbian RPI 3B, RPI zero ...
Enjoy 
Chris
.
?
- I just assumed that the Pi was effectively stuck so I manually rebooted
