If scripts don't found anything to do (i.e. no certidfcate neeeds to be revieweed), they do not output anything.
If there is work to do, progress is output to stdout and then mailed to the root (or acme) user. So, you need to setup mail forwarding from acme user to root. Thus you'll know immediately when your certificates were renewed, and of course, if something went wrong.
output from create_csr
From: root@mx.wagner.pp.ru (Cron Daemon)
To: root@mx.wagner.pp.ru
Subject: Cron <root@deneb> /usr/local/sbin/create_csr
Date: Tue, 6 Jun 2017 04:58:01 +0300 (MSK)
Generating CSR for domain wagner.pp.ru
Generating new key for domain wagner.pp.ru in /etc/apache2/wagner.pp.ru.newkey
Generating CSR for domain spacians.net
Generating new key for domain spacians.net in /etc/apache2/spacians.net.newkey
output from request_crt
From: root@mx.wagner.pp.ru (Cron Daemon)
To: acme@mx.wagner.pp.ru
Subject: Cron <acme@deneb> /usr/local/sbin/request_crt
Date: Tue, 6 Jun 2017 05:18:25 +0300 (MSK)
Getting certificate for spacians.net
Parsing account key...
Parsing CSR...
Registering account...
Already registered!
Verifying spacians.net...
spacians.net verified!
Verifying www.spacians.net...
www.spacians.net verified!
Signing certificate...
Certificate signed!
Getting certificate for wagner.pp.ru
Parsing account key...
Parsing CSR...
Registering account...
Already registered!
Verifying wagner.pp.ru...
wagner.pp.ru verified!
Verifying www.wagner.pp.ru...
www.wagner.pp.ru verified!
Signing certificate...
Certificate signed!
output from deploy_crt
From: root@mx.wagner.pp.ru (Cron Daemon)
To: root@mx.wagner.pp.ru
Subject: Cron <root@deneb> /usr/local/sbin/deploy_crt
Date: Tue, 6 Jun 2017 05:58:05 +0300 (MSK)
/home/acme/wagner.pp.ru.crt: OK
/home/acme/spacians.net.crt: OK