Enabled Revisions to existing custom post type not working WordPress

$cap_type="post";
$plural="Products";
$single="Product";
$cpt_name="products";

$opts['supports'] = array( 'products', 'title', 'editor', 'thumbnail', 'author', 'revisions' );
$opts['can_export'] = TRUE;
$opts['capability_type'] = $cap_type;
$opts['description'] = '';
$opts['exclude_from_search'] = FALSE;
$opts['has_archive'] = TRUE;
$opts['hierarchical'] = TRUE;
$opts['map_meta_cap'] = TRUE;
$opts['menu_icon'] = 'dashicons-products';
$opts['menu_position'] = 2;
$opts['public'] = TRUE;
$opts['publicly_queryable'] = TRUE;
$opts['query_var'] = TRUE;
$opts['register_meta_box_cb'] = '';
$opts['rewrite'] = array('slug'=>'products', 'with_front'=>false);
$opts['show_in_admin_bar'] = TRUE;
$opts['show_in_menu'] = TRUE;
$opts['show_in_nav_menu'] = TRUE;

$opts['labels']['add_new'] = esc_html__( "Add New", 'wisdom' );
$opts['labels']['add_new_item'] = esc_html__( "Add New {$single}", 'wisdom' );
$opts['labels']['all_items'] = esc_html__( "All {$plural}", 'wisdom' );
$opts['labels']['edit_item'] = esc_html__( "Edit {$single}" , 'wisdom' );
$opts['labels']['menu_name'] = esc_html__( $plural, 'wisdom' );
$opts['labels']['name'] = esc_html__( $plural, 'wisdom' );
$opts['labels']['name_admin_bar'] = esc_html__( $single, 'wisdom' );
$opts['labels']['new_item'] = esc_html__( "New {$single}", 'wisdom' );
$opts['labels']['not_found'] = esc_html__( "No {$single} found", 'wisdom');
$opts['labels']['not_found_in_trash'] = esc_html__( "Not found {$plural} in Trash", 'wisdom' );
$opts['labels']['parent_item_colon'] = esc_html__( "Parent {$plural} :", 'wisdom' );
$opts['labels']['search_items'] = esc_html__( "Search {$plural}", 'wisdom' );
$opts['labels']['singular_name'] = esc_html__( $single, 'wisdom' );
$opts['labels']['view_item'] = esc_html__( "View {$single}", 'wisdom' );
register_post_type( strtolower( $cpt_name ), $opts );

try this

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