While technially not a physical gift, it's something the recipient will experience IRL.
Two words: Singing. Telegram.
Readers! These are still a thing. And they are unexpected, fun, and amazing. Most small businesses who do singing telegrams will provide the option to deliver a letter, balloons, flowers, etc.
If your spouse needs a little pick-me-up and you want to wow them with a workday surprise - singing telegrams are the way to go. You can often select from a long song-list so it should be easy to find one that is meaningful to the two of you.
This is exactly what we want to see after a busy day working from home!