Triple vax guy here. Had 'rona in feb. Between 2 quick 5k's on 2 consecutive Saturdays, second post rona 5k as no slower after a week in bed, but felt so bad after. Taken me until the last month to get back to usual. Not I'll or out of breath, I could perform, I'd just feel winded after. If you have it like me, if the symptoms go you can do a marathon almost as quick, just prepare to feel like cr*p after. I was sleeping 12 hours a night the weeks after.
TL:DR You're choice, probs will be nearly as quick, but accept you may or may not feel terrible after