The documentation says USING CRON <expr> <time_zone>
but when I try to do something like 'USING CRON 20 01 * * * IST'
I'm getting an error that says
Invalid schedule was specified. "IST" is not a recognized time zone. Please specify time zones accepted by the TIMEZONE parameter.
'USING CRON 20 01 * * * Asia/Kolkata'
is the format you're looking for. This is how it's written according to this page