My boyfriend is having a busy day at work today. What do I text him to know how his day is going at work and to tell him I’m home now

You could send him a thoughtful message like this: "Hey love! Just checking in to see how your day at work is going. I’m home now and thinking of you. Let me know if you need a little break or just want to chat for a bit! 💖" This message shows you care and are interested in his day while letting him know you're available if he wants to talk.