Display next time invokes

Would like to see the next 10 (or even more up to 100 maybe - or customizable?) next execution times for a better view of the scheduled expression.

Example:
`cron: 4/5 * * * *`

```
next at 2020-08-13 11:59:00
then at 2020-08-13 12:04:00
then at 2020-08-13 12:09:00
then at 2020-08-13 12:14:00
then at 2020-08-13 12:19:00
.
.
.
```

