How can I extract hour from timestamp/time column in BigQuery?

Timestamp Column sample value: 4/1/2020 12:57:55

Time Column sample value: 12:57:55

I have tried using 

```
    EXTRACT(minute from Timestamp)
    split(Time,'')[ordinal(1)]

```

`split` returns only one value and does not solve my concern.
Regular SQL extract does not work.