Written and first recorded by Buffy St. Marie (1965).
Hit versions by The Four Pennies (UK #19 1965), Neil Diamond (US #53/MOR #11 1970), Elvis Presley (US#40/MOR #9/UK #5 1972), The New Birth (US #97/R&B #21 1973).
From the wiki: “‘Until It’s Time for You to Go’ was written by Canadian First Nations singer-songwriter Buffy Sainte-Marie for her 1965 album Many a Mile. It was a UK Top 20 hit for British group The Four Pennies in 1965, a Billboard Hot 100 single for Neil Diamond in 1970, an MOR and Top-5 UK for Elvis Presley in 1972, and a modest R&B hit in 1973 for The New Birth featuring future Supremes member Susaye Greene.”