Please check our recent article : “Temporal evolution and adaptation of SARS-COV-2 codon usage” which has been published online:

Manuscript Link: https://www.imrpress.com/journal/FBL/27/1/10.31083/j.fbl2701013

PDF Link: https://venus-pro-bucket.s3-accelerate.amazonaws.com/journal/FBL/27/1/10.31083/j.fbl2701013/2768-6698-27-1-013.pdf