If you go with one of the major manufacturers (Schneider/Modicon, ABB, Rockwell/Allen Bradley, Siemens) you'll get decent legacy support for smart relay type products and can be done very quickly. If it was a Chinese product I'd be more wary.
The smart relay products are really cool now. These are designed for these types of projects (bring in a sensor, run into a compare block and switch something on or off on a schedule). Once you go to a "proper" PLC it's way more powerful but significantly more work to get going and for a domestic project the F around factor isn't really worth it IMO.
I've burnt waaaaaaay to much (of my employers) money on modbus integrations over the years. If it's booleans it's ok, if it's Floats, especially when some manufacturers seem to love reverse doubles without documenting them, kill me.
Disclaimer: I work for one of the major automation OEMs and have managed a lot of very large integration projects so take that as you will.