I rejected a guy a year ago but we are still friends - is it too late to tell him I like him now?

Anonymous
I am starting to think I made a mistake rejecting him (because I assumed our backgrounds would clash despite him being open to it at the time plus I had just started seeing someone else).

We got on well at an away day and I gave him some very strong signals but I thought he wouldn't take me seriously because of my background/age but he did - he asked me out via messaging.

I said no but he wanted to stay friends and have lunch together and we met up a few times before Covid but we have been working from home for over a year so it's hard to have a casual lunch and work out if he still likes me. I am pretty sure he does and I don't think he is with anyone else.

I initiated a work meeting and it ended with him asking me to come work with his team. I don't want to make it awkward by saying anything now but at the same time... I don't want to not tell him... but I don't want to work in his team and it be weird because he is no longer interested.

I can get over it not working out if we worked because we're both mature enough to deal with it (I am now, I wasn't mature enough for him last year - there's a fair age gap). We last talked on Skype by video and he said he will schedule another meeting in a couple of weeks. I want to know if he's still interested in me but not sure whether to meet in person, text or call him. Should I just be honest and tell him? He was honest with me - I wasn't horrible about it and he seemed to understand at the time.
I rejected a guy a year ago but we are still friends - is it too late to tell him I like him now?
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