I'd love to believe the R7 (mirrorless 7D Mark II replacement) is a priority for Canon and is still on track for a 2021 announcement, but it's somewhat of a niche product and Canon hasn't appeared overly enthusiastic about APS-C as of late, especially in the R family. On the other hand, the olympics would be a good opportunity to highlight a high-end action-oriented camera.
As for the R1 (mirrorless 1DX Mark III replacement), I believe Canon *must* release a pro-level flagship "R" body sooner rather than later. The original EOS-1 was released in September, 1989, exactly 2-1/2 years after the first EOS camera (EOS 650) in March, 1987 (according to the dates at the Canon Camera Museum site). We're already more than two years past the original EOS R release (October, 2018). What's more, if they intentionally cripple it to prevent eating into 1DXiii sales, that will send a message that Canon isn't really serious about the R family.
I'm hoping the new Canon (the one that released the R5 and R6, not the one that released the 6D Mark II and M50 Mark II) realizes that if they don't outdo themselves (by superseding the 1DXiii), somebody else will (e.g. Sony), and then Canon will have to fight to get back those customers.