BOT for sending messages by timer from telegrams to viber. How to do? Where to find?

Question

Bots

Hello! Our tutor had a mandatory rule for sending messages at a certain time. To make sure we're in practice. Messages must arrive before 9 am. But I have a problem. I'm in practice on the second shift and I only go there at 3 o'clock.
Can you tell me how to make your own bot (so that the bot sends messages at 8 a.m. every weekday) or is there already one somewhere?
I myself am not engaged in programming and creating bots, but I will be glad if you help me with my problem!

I'm looking for something like this: youtu.be/FDe7hfyew14