To report your capital gains from selling your existing company RSU, you have to complete form 5000-S3 Schedule 3 - Capital Gains (or Losses) in 2020 and calculate the total amount of your taxable capital gains to enter that amount on line 12700 of your return.
Schedule 3 - Capital Gains (or Losses) in 2020 is applied for all type of capital gains which includes capital gains from selling existing company RSU.
For more information, you can use this link from the Canada Revenue Agency (CRA) website to verify How to Calculating and reporting your capital gains and losses.
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