Arrives By is fully compatible with Shopify's Translate & Adapt app.
Translating Delivery Time App Block
First, make sure that the Delivery Time app block is saved on your product page.
From the Translate & Adapt app, go to the "Theme" section and select "Templates".
Select "Product" to see the available translatable options.
You can customize the different settings for Delivery time here. You will need to add translations for every language your shop uses. If there is no translation, it will default to English.
Translating Custom Delivery Messages
Custom Delivery Messages for the Delivery Message app block (paid plan) use Shopify's metaobject system, so they can also be easily translated.
First, make sure you've created a Custom Delivery Message via the Arrives By app.
From the Translate & Adapt app, go to the "Online Store" section and select "Metaobjects".
Find the metaobject corresponding to your custom delivery message. This can be a bit difficult as Shopify does not provide a way to search metaobjects yet.
You can customize the delivery message here. You will need to add translations for every language your shop uses. If there is no translation, it will default to English.